Alan is suggesting that X.Org 7.6 targets X Server 1.9. If the new X Server release process is followed, X Server 1.9 should be released in September or October of 2010. This would be just under a year since the release of X.Org 7.5 / X Server 1.7. X.Org 7.6 may also be the first release to carry a hard requirement against XCB.
The details regarding these very early X.Org 7.6 plans can be found on the xorg-devel mailing list.