I wouldn't worry about when the
Java EE 6 versions of exams are going to be due. For starters, there will be a few months from when the betas are announced (or, frankly, the requests for SMEs to weight the priorities for the
test) until when they're available generally. Further, I don't believe that any of the application servers besides Glassfish are Java EE 6 compliant - the test really won't be valuable until there's a market for 6-specific software development. Worry more about 5 - for which there's plenty of servers - and you can prep for 6 when they start announcing it.