diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -179,7 +179,7 @@
     'rsrc/css/phui/workboards/phui-workboard-color.css' => 'e86de308',
     'rsrc/css/phui/workboards/phui-workboard.css' => '74fc9d98',
     'rsrc/css/phui/workboards/phui-workcard.css' => '9e9eb0df',
-    'rsrc/css/phui/workboards/phui-workpanel.css' => 'e5461a51',
+    'rsrc/css/phui/workboards/phui-workpanel.css' => '4e4ec9f0',
     'rsrc/css/sprite-login.css' => '18b368a6',
     'rsrc/css/sprite-tokens.css' => 'f1896dc5',
     'rsrc/css/syntax/syntax-default.css' => '055fc231',
@@ -409,16 +409,16 @@
     'rsrc/js/application/phortune/phortune-credit-card-form.js' => 'd12d214f',
     'rsrc/js/application/policy/behavior-policy-control.js' => '0eaa33a9',
     'rsrc/js/application/policy/behavior-policy-rule-editor.js' => '9347f172',
-    'rsrc/js/application/projects/WorkboardBoard.js' => '2f893acd',
+    'rsrc/js/application/projects/WorkboardBoard.js' => '31766c31',
     'rsrc/js/application/projects/WorkboardCard.js' => '0392a5d8',
     'rsrc/js/application/projects/WorkboardCardTemplate.js' => '2a61f8d4',
-    'rsrc/js/application/projects/WorkboardColumn.js' => 'c344eb3c',
+    'rsrc/js/application/projects/WorkboardColumn.js' => 'c3d24e63',
     'rsrc/js/application/projects/WorkboardController.js' => '42c7a5a7',
-    'rsrc/js/application/projects/WorkboardDropEffect.js' => 'c808589e',
+    'rsrc/js/application/projects/WorkboardDropEffect.js' => '8e0aa661',
     'rsrc/js/application/projects/WorkboardHeader.js' => '111bfd2d',
     'rsrc/js/application/projects/WorkboardHeaderTemplate.js' => 'ebe83a6b',
     'rsrc/js/application/projects/WorkboardOrderTemplate.js' => '03e8891f',
-    'rsrc/js/application/projects/behavior-project-boards.js' => 'cd7c9d4f',
+    'rsrc/js/application/projects/behavior-project-boards.js' => '8512e4ea',
     'rsrc/js/application/projects/behavior-project-create.js' => '34c53422',
     'rsrc/js/application/projects/behavior-reorder-columns.js' => '8ac32fd9',
     'rsrc/js/application/releeph/releeph-preview-branch.js' => '75184d68',
@@ -664,7 +664,7 @@
     'javelin-behavior-phuix-example' => 'c2c500a7',
     'javelin-behavior-policy-control' => '0eaa33a9',
     'javelin-behavior-policy-rule-editor' => '9347f172',
-    'javelin-behavior-project-boards' => 'cd7c9d4f',
+    'javelin-behavior-project-boards' => '8512e4ea',
     'javelin-behavior-project-create' => '34c53422',
     'javelin-behavior-quicksand-blacklist' => '5a6f6a06',
     'javelin-behavior-read-only-warning' => 'b9109f8f',
@@ -737,12 +737,12 @@
     'javelin-view-renderer' => '9aae2b66',
     'javelin-view-visitor' => '308f9fe4',
     'javelin-websocket' => 'fdc13e4e',
-    'javelin-workboard-board' => '2f893acd',
+    'javelin-workboard-board' => '31766c31',
     'javelin-workboard-card' => '0392a5d8',
     'javelin-workboard-card-template' => '2a61f8d4',
-    'javelin-workboard-column' => 'c344eb3c',
+    'javelin-workboard-column' => 'c3d24e63',
     'javelin-workboard-controller' => '42c7a5a7',
-    'javelin-workboard-drop-effect' => 'c808589e',
+    'javelin-workboard-drop-effect' => '8e0aa661',
     'javelin-workboard-header' => '111bfd2d',
     'javelin-workboard-header-template' => 'ebe83a6b',
     'javelin-workboard-order-template' => '03e8891f',
@@ -869,7 +869,7 @@
     'phui-workboard-color-css' => 'e86de308',
     'phui-workboard-view-css' => '74fc9d98',
     'phui-workcard-view-css' => '9e9eb0df',
-    'phui-workpanel-view-css' => 'e5461a51',
+    'phui-workpanel-view-css' => '4e4ec9f0',
     'phuix-action-list-view' => 'c68f183f',
     'phuix-action-view' => 'aaa08f3b',
     'phuix-autocomplete' => '8f139ef0',
@@ -1178,7 +1178,11 @@
       'phuix-autocomplete',
       'javelin-mask',
     ),
-    '2f893acd' => array(
+    '308f9fe4' => array(
+      'javelin-install',
+      'javelin-util',
+    ),
+    '31766c31' => array(
       'javelin-install',
       'javelin-dom',
       'javelin-util',
@@ -1190,10 +1194,6 @@
       'javelin-workboard-card-template',
       'javelin-workboard-order-template',
     ),
-    '308f9fe4' => array(
-      'javelin-install',
-      'javelin-util',
-    ),
     '32755edb' => array(
       'javelin-install',
       'javelin-util',
@@ -1351,6 +1351,9 @@
       'phuix-icon-view',
       'javelin-behavior-phabricator-gesture',
     ),
+    '4e4ec9f0' => array(
+      'phui-workcard-view-css',
+    ),
     '4e61fa88' => array(
       'javelin-behavior',
       'javelin-aphlict',
@@ -1591,6 +1594,16 @@
       'javelin-dom',
       'javelin-vector',
     ),
+    '8512e4ea' => array(
+      'javelin-behavior',
+      'javelin-dom',
+      'javelin-util',
+      'javelin-vector',
+      'javelin-stratcom',
+      'javelin-workflow',
+      'javelin-workboard-controller',
+      'javelin-workboard-drop-effect',
+    ),
     '87428eb2' => array(
       'javelin-behavior',
       'javelin-diffusion-locate-file-source',
@@ -1636,6 +1649,10 @@
       'phabricator-shaped-request',
       'conpherence-thread-manager',
     ),
+    '8e0aa661' => array(
+      'javelin-install',
+      'javelin-dom',
+    ),
     '8e2d9a28' => array(
       'phui-theme-css',
     ),
@@ -1940,17 +1957,17 @@
       'javelin-dom',
       'phuix-button-view',
     ),
-    'c344eb3c' => array(
-      'javelin-install',
-      'javelin-workboard-card',
-      'javelin-workboard-header',
-    ),
     'c3703a16' => array(
       'javelin-behavior',
       'javelin-aphlict',
       'phabricator-phtize',
       'javelin-dom',
     ),
+    'c3d24e63' => array(
+      'javelin-install',
+      'javelin-workboard-card',
+      'javelin-workboard-header',
+    ),
     'c687e867' => array(
       'javelin-behavior',
       'javelin-dom',
@@ -1979,10 +1996,6 @@
       'phuix-icon-view',
       'phabricator-busy',
     ),
-    'c808589e' => array(
-      'javelin-install',
-      'javelin-dom',
-    ),
     'c8147a20' => array(
       'javelin-behavior',
       'javelin-dom',
@@ -2002,16 +2015,6 @@
       'javelin-vector',
       'javelin-magical-init',
     ),
-    'cd7c9d4f' => array(
-      'javelin-behavior',
-      'javelin-dom',
-      'javelin-util',
-      'javelin-vector',
-      'javelin-stratcom',
-      'javelin-workflow',
-      'javelin-workboard-controller',
-      'javelin-workboard-drop-effect',
-    ),
     'cf32921f' => array(
       'javelin-behavior',
       'javelin-dom',
@@ -2072,9 +2075,6 @@
       'javelin-dom',
       'javelin-history',
     ),
-    'e5461a51' => array(
-      'phui-workcard-view-css',
-    ),
     'e562708c' => array(
       'javelin-install',
     ),
diff --git a/src/applications/project/controller/PhabricatorProjectBoardViewController.php b/src/applications/project/controller/PhabricatorProjectBoardViewController.php
--- a/src/applications/project/controller/PhabricatorProjectBoardViewController.php
+++ b/src/applications/project/controller/PhabricatorProjectBoardViewController.php
@@ -623,10 +623,20 @@
       $drop_effects = $column->getDropEffects();
       $drop_effects = mpull($drop_effects, 'toDictionary');
 
+      $preview_effect = null;
+      if ($column->canHaveTrigger()) {
+        $trigger = $column->getTrigger();
+        if ($trigger) {
+          $preview_effect = $trigger->getPreviewEffect()
+            ->toDictionary();
+        }
+      }
+
       $column_templates[] = array(
         'columnPHID' => $column_phid,
         'effects' => $drop_effects,
         'cardPHIDs' => $card_phids,
+        'triggerPreviewEffect' => $preview_effect,
       );
     }
 
@@ -652,12 +662,8 @@
 
     $properties = array();
     foreach ($all_tasks as $task) {
-      $properties[$task->getPHID()] = array(
-        'points' => (double)$task->getPoints(),
-        'status' => $task->getStatus(),
-        'priority' => (int)$task->getPriority(),
-        'owner' => $task->getOwnerPHID(),
-      );
+      $properties[$task->getPHID()] =
+        PhabricatorBoardResponseEngine::newTaskProperties($task);
     }
 
     $behavior_config = array(
@@ -1263,26 +1269,15 @@
       $trigger_icon = 'fa-cogs grey';
     }
 
-    if ($trigger) {
-      $trigger_tip = array(
-        pht('%s: %s', $trigger->getObjectName(), $trigger->getDisplayName()),
-        $trigger->getRulesDescription(),
-      );
-      $trigger_tip = implode("\n", $trigger_tip);
-    } else {
-      $trigger_tip = pht('No column trigger.');
-    }
-
     $trigger_button = id(new PHUIIconView())
       ->setIcon($trigger_icon)
       ->setHref('#')
       ->addSigil('boards-dropdown-menu')
-      ->addSigil('has-tooltip')
+      ->addSigil('trigger-preview')
       ->setMetadata(
         array(
           'items' => hsprintf('%s', $trigger_menu),
-          'tip' => $trigger_tip,
-          'size' => 300,
+          'columnPHID' => $column->getPHID(),
         ));
 
     return $trigger_button;
diff --git a/src/applications/project/engine/PhabricatorBoardResponseEngine.php b/src/applications/project/engine/PhabricatorBoardResponseEngine.php
--- a/src/applications/project/engine/PhabricatorBoardResponseEngine.php
+++ b/src/applications/project/engine/PhabricatorBoardResponseEngine.php
@@ -131,10 +131,7 @@
           $card['headers'][$order_key] = $header;
         }
 
-        $card['properties'] = array(
-          'points' => (double)$object->getPoints(),
-          'status' => $object->getStatus(),
-        );
+        $card['properties'] = self::newTaskProperties($object);
       }
 
       if ($card_phid === $object_phid) {
@@ -159,6 +156,15 @@
       ->setContent($payload);
   }
 
+  public static function newTaskProperties($task) {
+    return array(
+      'points' => (double)$task->getPoints(),
+      'status' => $task->getStatus(),
+      'priority' => (int)$task->getPriority(),
+      'owner' => $task->getOwnerPHID(),
+    );
+  }
+
   private function buildTemplate($object) {
     $viewer = $this->getViewer();
     $object_phid = $this->getObjectPHID();
diff --git a/src/applications/project/icon/PhabricatorProjectDropEffect.php b/src/applications/project/icon/PhabricatorProjectDropEffect.php
--- a/src/applications/project/icon/PhabricatorProjectDropEffect.php
+++ b/src/applications/project/icon/PhabricatorProjectDropEffect.php
@@ -7,6 +7,8 @@
   private $color;
   private $content;
   private $conditions = array();
+  private $isTriggerEffect;
+  private $isHeader;
 
   public function setIcon($icon) {
     $this->icon = $icon;
@@ -40,6 +42,8 @@
       'icon' => $this->getIcon(),
       'color' => $this->getColor(),
       'content' => hsprintf('%s', $this->getContent()),
+      'isTriggerEffect' => $this->getIsTriggerEffect(),
+      'isHeader' => $this->getIsHeader(),
       'conditions' => $this->getConditions(),
     );
   }
@@ -58,4 +62,22 @@
     return $this->conditions;
   }
 
+  public function setIsTriggerEffect($is_trigger_effect) {
+    $this->isTriggerEffect = $is_trigger_effect;
+    return $this;
+  }
+
+  public function getIsTriggerEffect() {
+    return $this->isTriggerEffect;
+  }
+
+  public function setIsHeader($is_header) {
+    $this->isHeader = $is_header;
+    return $this;
+  }
+
+  public function getIsHeader() {
+    return $this->isHeader;
+  }
+
 }
diff --git a/src/applications/project/storage/PhabricatorProjectTrigger.php b/src/applications/project/storage/PhabricatorProjectTrigger.php
--- a/src/applications/project/storage/PhabricatorProjectTrigger.php
+++ b/src/applications/project/storage/PhabricatorProjectTrigger.php
@@ -198,36 +198,6 @@
     return $effects;
   }
 
-  public function getRulesDescription() {
-    $rules = $this->getTriggerRules();
-    if (!$rules) {
-      return pht('Does nothing.');
-    }
-
-    $things = array();
-
-    $count = count($rules);
-    $limit = 3;
-
-    if ($count > $limit) {
-      $show_rules = array_slice($rules, 0, ($limit - 1));
-    } else {
-      $show_rules = $rules;
-    }
-
-    foreach ($show_rules as $rule) {
-      $things[] = $rule->getDescription();
-    }
-
-    if ($count > $limit) {
-      $things[] = pht(
-        '(Applies %s more actions.)',
-        new PhutilNumber($count - $limit));
-    }
-
-    return implode("\n", $things);
-  }
-
   public function newDropTransactions(
     PhabricatorUser $viewer,
     PhabricatorProjectColumn $column,
@@ -265,6 +235,15 @@
     return $trigger_xactions;
   }
 
+  public function getPreviewEffect() {
+    $header = pht('Trigger: %s', $this->getDisplayName());
+
+    return id(new PhabricatorProjectDropEffect())
+      ->setIcon('fa-cogs')
+      ->setColor('blue')
+      ->setIsHeader(true)
+      ->setContent($header);
+  }
 
 
 /* -(  PhabricatorApplicationTransactionInterface  )------------------------- */
diff --git a/src/applications/project/trigger/PhabricatorProjectTriggerInvalidRule.php b/src/applications/project/trigger/PhabricatorProjectTriggerInvalidRule.php
--- a/src/applications/project/trigger/PhabricatorProjectTriggerInvalidRule.php
+++ b/src/applications/project/trigger/PhabricatorProjectTriggerInvalidRule.php
@@ -16,12 +16,6 @@
     return $this->exception;
   }
 
-  public function getDescription() {
-    return pht(
-      'Invalid rule (of type "%s").',
-      $this->getRecord()->getType());
-  }
-
   public function getSelectControlName() {
     return pht('(Invalid Rule)');
   }
diff --git a/src/applications/project/trigger/PhabricatorProjectTriggerManiphestStatusRule.php b/src/applications/project/trigger/PhabricatorProjectTriggerManiphestStatusRule.php
--- a/src/applications/project/trigger/PhabricatorProjectTriggerManiphestStatusRule.php
+++ b/src/applications/project/trigger/PhabricatorProjectTriggerManiphestStatusRule.php
@@ -5,14 +5,6 @@
 
   const TRIGGERTYPE = 'task.status';
 
-  public function getDescription() {
-    $value = $this->getValue();
-
-    return pht(
-      'Changes status to "%s".',
-      ManiphestTaskStatus::getTaskStatusName($value));
-  }
-
   public function getSelectControlName() {
     return pht('Change status to');
   }
diff --git a/src/applications/project/trigger/PhabricatorProjectTriggerRule.php b/src/applications/project/trigger/PhabricatorProjectTriggerRule.php
--- a/src/applications/project/trigger/PhabricatorProjectTriggerRule.php
+++ b/src/applications/project/trigger/PhabricatorProjectTriggerRule.php
@@ -37,7 +37,6 @@
     return $this->getRecord()->getValue();
   }
 
-  abstract public function getDescription();
   abstract public function getSelectControlName();
   abstract public function getRuleViewLabel();
   abstract public function getRuleViewDescription($value);
@@ -111,7 +110,8 @@
   }
 
   final protected function newEffect() {
-    return new PhabricatorProjectDropEffect();
+    return id(new PhabricatorProjectDropEffect())
+      ->setIsTriggerEffect(true);
   }
 
   final public function toDictionary() {
diff --git a/src/applications/project/trigger/PhabricatorProjectTriggerUnknownRule.php b/src/applications/project/trigger/PhabricatorProjectTriggerUnknownRule.php
--- a/src/applications/project/trigger/PhabricatorProjectTriggerUnknownRule.php
+++ b/src/applications/project/trigger/PhabricatorProjectTriggerUnknownRule.php
@@ -5,12 +5,6 @@
 
   const TRIGGERTYPE = 'unknown';
 
-  public function getDescription() {
-    return pht(
-      'Unknown rule (of type "%s").',
-      $this->getRecord()->getType());
-  }
-
   public function getSelectControlName() {
     return pht('(Unknown Rule)');
   }
diff --git a/webroot/rsrc/css/phui/workboards/phui-workpanel.css b/webroot/rsrc/css/phui/workboards/phui-workpanel.css
--- a/webroot/rsrc/css/phui/workboards/phui-workpanel.css
+++ b/webroot/rsrc/css/phui/workboards/phui-workpanel.css
@@ -201,6 +201,7 @@
   text-overflow: ellipsis;
   margin: 4px 8px;
   color: {$greytext};
+  border-radius: 3px;
 }
 
 .workboard-drop-preview li .phui-icon-view {
@@ -214,3 +215,13 @@
   background: {$bluebackground};
   margin-right: 6px;
 }
+
+.workboard-drop-preview .workboard-drop-preview-header {
+  background: {$sky};
+  color: #fff;
+}
+
+.workboard-drop-preview .workboard-drop-preview-header .phui-icon-view {
+  background: {$blue};
+  color: #fff;
+}
diff --git a/webroot/rsrc/js/application/projects/WorkboardBoard.js b/webroot/rsrc/js/application/projects/WorkboardBoard.js
--- a/webroot/rsrc/js/application/projects/WorkboardBoard.js
+++ b/webroot/rsrc/js/application/projects/WorkboardBoard.js
@@ -41,6 +41,8 @@
     _cards: null,
     _dropPreviewNode: null,
     _dropPreviewListNode: null,
+    _previewPHID: null,
+    _hidePreivew: false,
 
     getRoot: function() {
       return this._root;
@@ -141,6 +143,82 @@
 
         this._columns[phid] = new JX.WorkboardColumn(this, phid, node);
       }
+
+      var on_over = JX.bind(this, this._showTriggerPreview);
+      var on_out = JX.bind(this, this._hideTriggerPreview);
+      JX.Stratcom.listen('mouseover', 'trigger-preview', on_over);
+      JX.Stratcom.listen('mouseout', 'trigger-preview', on_out);
+    },
+
+    _showTriggerPreview: function(e) {
+      if (this._disablePreview) {
+        return;
+      }
+
+      var target = e.getTarget();
+      var node = e.getNode('trigger-preview');
+
+      if (target !== node) {
+        return;
+      }
+
+      var phid = JX.Stratcom.getData(node).columnPHID;
+      var column = this._columns[phid];
+
+      // Bail out if we don't know anything about this column.
+      if (!column) {
+        return;
+      }
+
+      if (phid === this._previewPHID) {
+        return;
+      }
+
+      this._previewPHID = phid;
+
+      var effects = column.getDropEffects();
+
+      var triggers = [];
+      for (var ii = 0; ii < effects.length; ii++) {
+        if (effects[ii].getIsTriggerEffect()) {
+          triggers.push(effects[ii]);
+        }
+      }
+
+      if (triggers.length) {
+        var header = column.getTriggerPreviewEffect();
+        triggers = [header].concat(triggers);
+      }
+
+      this._showEffects(triggers);
+    },
+
+    _hideTriggerPreview: function(e) {
+      if (this._disablePreview) {
+        return;
+      }
+
+      var target = e.getTarget();
+
+      if (target !== e.getNode('trigger-preview')) {
+        return;
+      }
+
+      this._removeTriggerPreview();
+    },
+
+    _removeTriggerPreview: function() {
+      this._showEffects([]);
+      this._previewPHID = null;
+    },
+
+    _beginDrag: function() {
+      this._disablePreview = true;
+      this._showEffects([]);
+    },
+
+    _endDrag: function() {
+      this._disablePreview = false;
     },
 
     _setupDragHandlers: function() {
@@ -186,6 +264,9 @@
 
         list.listen('didDrop', JX.bind(this, this._onmovecard, list));
 
+        list.listen('didBeginDrag', JX.bind(this, this._beginDrag));
+        list.listen('didEndDrag', JX.bind(this, this._endDrag));
+
         lists.push(list);
       }
 
@@ -195,18 +276,16 @@
     },
 
     _didChangeDropTarget: function(src_list, src_node, dst_list, dst_node) {
-      var node = this._getDropPreviewNode();
-
       if (!dst_list) {
         // The card is being dragged into a dead area, like the left menu.
-        JX.DOM.remove(node);
+        this._showEffects([]);
         return;
       }
 
       if (dst_node === false) {
         // The card is being dragged over itself, so dropping it won't
         // affect anything.
-        JX.DOM.remove(node);
+        this._showEffects([]);
         return;
       }
 
@@ -217,7 +296,6 @@
       var dst_column = this.getColumn(dst_phid);
 
       var effects = [];
-
       if (src_column !== dst_column) {
         effects = effects.concat(dst_column.getDropEffects());
       }
@@ -239,6 +317,12 @@
       }
       effects = visible;
 
+      this._showEffects(effects);
+    },
+
+    _showEffects: function(effects) {
+      var node = this._getDropPreviewNode();
+
       if (!effects.length) {
         JX.DOM.remove(node);
         return;
@@ -251,7 +335,6 @@
       }
 
       JX.DOM.setContent(this._getDropPreviewListNode(), items);
-
       document.body.appendChild(node);
     },
 
diff --git a/webroot/rsrc/js/application/projects/WorkboardColumn.js b/webroot/rsrc/js/application/projects/WorkboardColumn.js
--- a/webroot/rsrc/js/application/projects/WorkboardColumn.js
+++ b/webroot/rsrc/js/application/projects/WorkboardColumn.js
@@ -28,6 +28,10 @@
     this._dropEffects = [];
   },
 
+  properties: {
+    triggerPreviewEffect: null
+  },
+
   members: {
     _phid: null,
     _root: null,
diff --git a/webroot/rsrc/js/application/projects/WorkboardDropEffect.js b/webroot/rsrc/js/application/projects/WorkboardDropEffect.js
--- a/webroot/rsrc/js/application/projects/WorkboardDropEffect.js
+++ b/webroot/rsrc/js/application/projects/WorkboardDropEffect.js
@@ -11,6 +11,8 @@
     icon: null,
     color: null,
     content: null,
+    isTriggerEffect: false,
+    isHeader: false,
     conditions: []
   },
 
@@ -20,6 +22,8 @@
         .setIcon(map.icon)
         .setColor(map.color)
         .setContent(JX.$H(map.content))
+        .setIsTriggerEffect(map.isTriggerEffect)
+        .setIsHeader(map.isHeader)
         .setConditions(map.conditions || []);
     }
   },
@@ -31,7 +35,13 @@
         .setColor(this.getColor())
         .getNode();
 
-      return JX.$N('li', {}, [icon, this.getContent()]);
+      var attributes = {};
+
+      if (this.getIsHeader()) {
+        attributes.className = 'workboard-drop-preview-header';
+      }
+
+      return JX.$N('li', attributes, [icon, this.getContent()]);
     },
 
     isEffectVisibleForCard: function(card) {
diff --git a/webroot/rsrc/js/application/projects/behavior-project-boards.js b/webroot/rsrc/js/application/projects/behavior-project-boards.js
--- a/webroot/rsrc/js/application/projects/behavior-project-boards.js
+++ b/webroot/rsrc/js/application/projects/behavior-project-boards.js
@@ -108,6 +108,12 @@
     for (jj = 0; jj < spec.cardPHIDs.length; jj++) {
       column.newCard(spec.cardPHIDs[jj]);
     }
+
+    if (spec.triggerPreviewEffect) {
+      column.setTriggerPreviewEffect(
+        JX.WorkboardDropEffect.newFromDictionary(
+          spec.triggerPreviewEffect));
+    }
   }
 
   var order_maps = config.orderMaps;