Ian Romanick announced the Mesa 9.1.4 release on Monday. Mesa 9.1.4 offers back-ported bug-fixes to the open-source graphics drivers, mostly affecting the Intel DRI driver along with two LLVMpipe driver fixes.
The Mesa 9.1.4 changes include adding in support for new Haswell graphics PCI IDs, Mesa demo error corrections for Sandy Bridge / Ivy Bridge / Haswell, a GM45 Piglit GLSL 1.10 crash, and some other items. The non-Intel changes include an EGL GLES1 tri_x11 test rendering wrong, glDrawElements producing a segmentation fault, the R300g driver having strange light issues in Penumbra, and two LLVMpipe segmentation faults.
More details on Mesa 9.1.4 can be found via the mailing list announcement
and the documentation file
For those Linux enthusiasts living on the bleeding edge, all of the interesting Mesa activity remains in Git master for the Mesa 9.2 release in a few months time.