This updated Linux graphics / input stack has been in testing the past few weeks via a Personal Package Archive (PPA) and is now deemed ready for the mainline repository so that all of the new bits can be found in Ubuntu 11.04 Alpha 2 when released next week.
Canonical's Bryce Harrington warns of turbulence ahead in this mailing list message for the Natty repository over the next few days due to merging these X packages and the breaks it may cause.
The main X.Org driver updates are of course the xf86-video-intel, xf86-video-ati, and and xf86-video-nouveau drivers along with xf86-input-synaptics, xf86-input-evdev, and the rest. Canonical has also made the decision to strip away several vintage X.Org drivers from the main repository, including the APM, Ark, Chips, Glide, i740, Tseng, and Voodoo drivers. These drivers aren't too well maintained any more and are rarely used by Ubuntu users. For right now these dropped drivers will be available for manual installation via the Natty Universe repository.
For the time being this package pull also means the ATI Catalyst driver will not work with Ubuntu 11.04 but only the open-source ATI/AMD Radeon driver. The Linux 2.6.37 kernel support is now in place with today's Catalyst 11.1 release, but the X.Org Server 1.10 isn't yet in the public driver. It will also need to support the Linux 2.6.38 changes too if Ubuntu Natty begins tracking that upcoming kernel. NVIDIA's new beta driver meanwhile should play fine with these newest bits.
Look for Ubuntu 11.04 Alpha 2 with these changes by the end of next week while the stable release will be out in April.