Clint Covington has a hint to allow us to get a preview of what a project will look like when running under the Access 2007 runtime:

I know, the runtime hasn’t shipped yet. If you are looking for a simple way to share a database with co-workers and you don’t want them messing around with things… Try renaming the file to ACCDR. This is the equivalent of running the database with the /runtime switch. Basically the ribbon and nav pane get turned off.

I found a comment on a German blog quoting somebody who was quoting somebody that the runtime would ship “sometime in the March timeframe”. Let’s hope so.