Carl Worth of Intel's Open-Source Technology Center announced the release of Mesa 10.0.5 and 10.1.1. Both releases of these past two stable Mesa release series offer an assortment of bug-fixes while not adding in any major features or functionality.
The brief release announcements for Mesa 10.0.5 and 10.1.1 can be read here and here.
Meanwhile, the major new work for the Mesa 3D library and open-source graphics hardware drivers is centered around Mesa 10.2. Mesa 10.2 should be released in just over one month and features many open-source OpenGL driver improvements.