Anyhow, work on Mesa 7.7 has already started. A number of commits have poured into Mesa's Git "master" code-base. Among this work are commits affecting LLVMpipe, the Intel i915 Gallium3D driver, the Radeon Gallium3D driver, and the general Mesa stack. The Intel hardware driver and software rasterizer has picked up support for the GL_ARB_draw_elements_base_vertex, GL_ARB_depth_clamp, and GL_NV_depth_clamp. The two prior OpenGL extensions are part of the OpenGL 3 specification, which Mesa has slowly been adopting.
Look for many more changes to come before Mesa 7.7 is released in a few months. Mesa 7.6 meanwhile still has to make it out the door too.