Since the release of X Server 1.7.0 there has been a flow of X package updates that did not have stable releases available that incorporated the bug-fixes and new features that accumulated in many of the packages since the X.Org 7.4 release more than a year ago. Most of the X.Org packages are now ready for the 7.5 release, but there are still a few more expected before X.Org 7.5 is officially released. Additionally, X Server 1.7.1 will be released in time for X.Org 7.5.
The X.Org 7.5 Release Candidate 1 announcement was made by Sun's Alan Coopersmith on the X.Org mailing list. X.Org 7.5 should be out within a few weeks.