Maarten Lankhorst on the behalf of Canonical's X team for Ubuntu has issued a "call for testing" of Mesa 10.0. For Ubuntu users there is the Ubuntu 14.04 "Trusty" ppa:ubuntu-x-swat/ppa archive that can be used right now. Their plan is to upload Mesa 10 to the Ubuntu Trusty archive on Monday so they're hoping for some testing of these packages.
The testing done by Maarten on the new packages is just with a Radeon HD 5570, NVIDIA NV96, Intel Sandy Bridge, and LLVMpipe drivers. Glxinfo and Piglit at least run along with the Unity desktop. For call for testing of the new Mesa 10.0 packages can be found on the ubuntu-devel list.
Seeing as Mesa 10.0 was just released days ago it's great to see Canonical already lining up to land it into the archive for their next Ubuntu release. In past release cycles they've held off on landing new Mesa versions so that there can be better test coverage and bug reporting of the Mesa version currently in their latest stable release.
For those Ubuntu Linux users running 13.10 or other recent versions besides 14.04 where the ubuntu-x-swat PPA is covered, try out the Ubuntu Oibaf PPA for all the latest open-source Linux graphics driver packages.