At the end of October X Server 1.7.1
was released and at that time Peter Hutterer had said that the 1.7.2 build should arrive in about five weeks. It hasn't been five weeks yet, but it looks like he's still on track to delivering this bug-fix release on time or earlier. Peter has just announced the first pre-1.7.2 development release.
The xorg-server 126.96.36.1991 release carries 18 changes atop the 1.7.1 release that can be found in X.Org 7.5. These changes include various fixes for EDID, X Input, EXA, X Quartz, and other areas. Expect X Server 1.7.2 to be properly released with these changes (plus likely a few more) later on in November or early December.
Meanwhile, the bulk of the development work is being focused on X Server 1.8
, which should be released in March of 2010