Did anybody try to get play 2.0 on GAE? Play is now based on sbt, technically sbt-appengine-plugin should work. And if you have tried, what is your datastore setup?
I don't beleive it will work as, if I'm not mistaken, GAE requires a war file, which Play 2.0 can't generate.
That will not be possible until Play 2.1 (as per current plan)