It's been awhile since the last status update so here it is:
- nouveau Gallium3d driver now installed in the default libgl1-mesa-dri package - no need to install libgl1-mesa-dri-experimental anymore
- added VDPAU and XvMC support (pipe-video branch) for r300/r600/nouveau drivers in the libg3dvl-mesa package
- 2D/Xv/3D support for AMD Radeon HD 6950/6970 Cayman graphics cards
- Ivybridge support
- r300g bug fixes
- other crash fixes (especially llvm related)
EDIT: VDPAU and XvMC are also supported on r300 now! Unfortunately XvMC doesn't work (myssing symbol) and VDPAU is slower than Xv.