The development cycle for X.Org 7.4 has stretched on for months longer than anticipated, and earlier this month it sounded like X.Org 7.4 would end with a quick release, but still it's being dragged out longer. This morning the release manager for X.Org 7.4, Adam Jackson, had announced the release of X Server 1.4.99.904...
i think x.org has too many big developments going on at the same time, which makes it problematic to meet release schedules, because the codebase has to stabilize at some point.
that's pretty problematic. let's hope things go easier after 1.5.