My intention is that these will be the last release candidates. Unless there is some major show-stopping bug discovered, I plan to release 7.7.1 and 7.8 this *Friday*. I will ping people on IRC before making the release.
As said by Intel's Ian Romanick on the Mesa3D-announce list. Mesa 7.8 includes the new OpenGL ES 1.1/2.0 state trackers for Gallium3D, new Gallium3D documentation, much improved EGL support, support for new OpenGL extensions, and many other improvements.