Several open requests would be best driven through a cohesive piece of preview/draft infrastructure provided as part of EditEngine.

Some of these requests are probably things we will not actually bring upstream, but if we were to pursue them they'd be adjacent here:

• T10859 requests title previews in Phriction. There is currently no easy way to ship multiple fields to previews.
• T5811 requests in-progress edits of text areas, like the "Content" text area in Phriction, be saved as drafts.
• T4768 requests generalized conflict detection.
• T665 wants Phabricator to work offline, more or less, but I think there's nothing we can realistically do here and plan to WONTFIX it.