X.org is an evolution from the XFree86 project, that became the widely accepted "reference" implementation in 2004. X.org improves upon XFree86 in terms of the way the project is coordinated, the way the codebase is organised and the approach to graphics acceleration.
The X.org team is hard at work on a new Acceleration Architecture, as well as the inclusion of a variety of exciting new X features such as window composition (which allows for sexy transparency effects).
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All bugs Latest bugs reported
Bug #1465506: plane A assertion failure (expected on, current off) on Intel NUC 5i5RYH
Reported on 2015-08-31
Bug #1421575: Desktop corruption when changing monitor config
Reported on 2015-08-24
Bug #1453298: Xubuntu freeze once a day
Reported on 2015-08-21
Bug #1443456: Xorg crashed with SIGABRT in fbBltOne()
Reported on 2015-08-06
Bug #1463263: ssh-based X11 forwarding not working in 15.04 following upgrade from 14.10
Reported on 2015-06-10