It sounds absolutely great!
I'm looking forward to seeing how this progresses. For the applications I build there is one other vital piece to the puzzle, and that's the ability to choose resource files via a (configurable) jboss-app.xml. This allows one to let JBoss work wit pre-defined sets of resources depending on a startup parameter. This works amazingly well in JBoss AS 6 and before, but I'm afraid it's one of those things that even their own developers aren't really aware of.