Xorg/Mesa updates

[bf]

I'm guessing that there will be some updates to Xorg 7.4 (or later) and Mesa
7.2 entering the ports tree after the release of FreeBSD 6.4 and 7.1.  Has
anybody tested patches? Does  http://git.xbsd.org/freebsd/ports/ contain the
latest such work?  Can anybody "in the know" describe the likely timeline
for such updates, or elaborate upon obstacles to such an update that have
prevented such work from going forward?

Regards,
           b.