Google's App Engine to get Java?

Warning: All the "content" in that post is contained within the title line. Could have been a single tweet. Nothing certain, but rumored to be late May.

If this happens, what is the likelihood of any of the JVM languages working there as well? (I haven't used GAE, so I have no idea how it is with libraries.)

It'd be fun to have Jython, JRuby, Groovy, Clojure, etc on GAE.

Is it a surprising choice? Do you think they would have been better off targeting more hackerly type language, since companies aren't going to be too quick in moving to AppEngine in the early term?

I would be interested in the memory limitations Google would impose. Java pretty much requires lots at startup. Would Google charge for more memory?

It's not exactly news.

A Googler accidentally mentioned this at their dev. conference in India last year.

The "other language" (which has been in the AppEngine roadmap for a long time) was always going to be either Java or Javascript, but all the bets were on Java