We use a merge based deployment workflow with a special branch and some post-receive hooks.
I've setup a herald rule which looks for the merge commits (indicating a deployment) in this special branches and send out emails to the team containing information about what did just go live.
However by default it will just show the merge commit info and not what was merged with it.
The attached patch will check if the commit in the email is a merge and if it is will get the merged commits authors/summary and add a section to the email for it.