The JSR316 (JavaTM Platform, Enterprise Edition 6 (Java EE 6) Specification) is, according to this very "Specification" page, "targeted to ship in 2008.".
Ahem.
If you compare their Stages with those of the previous JEE (JEE 5 in JSR 244), you will realize that:
- JEE6 is at the "Early Draft Review " stage finished in November 2008
- The number of months between JEE5 "Early Draft Review " and its final release was: 12 months (may 2005 to its final release in may 2006).
So here you go. I do not know if the parallel is accurate, but that is the only date you can guesstimate for now. Even though InfoQ or JavaOne2008 mentioned "early 2009" as a possible ship date, it might be a tiny bit later than that (like "Q4 2009"!)