The first 1.8 snapshot came in late October followed by a second snapshot just before the winter holidays. The first X Server 1.8 release candidate came in mid-February. Over the night, Keith Packard has now put out the second release candidate.
X Server 1.8 Release Candidate 2 has arrived and its fixes are scattered across the board from XQuartz to DIX. The complete list of changes between RC1 and RC2 can be found in Keith's announcement.
According to the published schedule, we're supposed to be closing in on the release within the next couple of weeks. I'm pretty satisfied with the current state of the code, but I'd love to hear about regressions that people are finding so that we can clean things up before the release.
At least it won't be as late as X.Org 7.5, which was supposed to come in April, but actually didn't come until late October, and these sort of delays have been the case with other recent releases too. The difference this time around is a greater commitment to delivering releases on a timely basis and there's also development process changes.