On the same day of the first X Server 1.8 snapshot
being released, Sun's Alan Coopersmith who has been leading the X.Org 7.5 katamari release efforts
has shared his thoughts going forward for X.Org 7.6. X Server 1.7.1
should be released by week's end and X.Org 7.5 final should be out shortly thereafter. However, it's not likely that X Server 1.8 will be greeted by X.Org 7.6.
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