Congrats guys, I've always liked Play very very much. I honestly didn't know play was part of the typesafe stack and it looks like a lot of my old sbt+Play1+Scala module issues are gone. The first time I used Play it was because I could use the Scala module, and now I'm absolutely gaga that Scala has first class support.
Play 2.0-beta is the correct title for this. They do not recommend it for new applications YET. Anyway coming from Rails, this looks quite interesting. I am trying to understand how they handle asynchronous requests and Ajax. For Rails we really have to use plugins (looking at apotomo).
I can only speak from my very limited context, which is "big banks, and payment processing". This won't dent that realm in the least, at least not anytime soon. The tech I'm using is 5-8 years old (J2EE, some even in Java 1.4 still), and the banks have no desire to move off of it.
A few "renegades" are using JBoss for some small one-offs, but nothing in their main processing stacks. With open source, there's no one to sue, no one to hold to the fire, and "only hippies write systems with it"(a paraphrase, obviously).
It crushes my soul. (But pays my mortgage.) I'm really conflicted as to my future, honestly.
Again, this is a very narrow view of a very limited scope, so I'd be anxious to hear other people's experience.