GNOME 3.7 development is getting underway, with the 3.7.1 snapshot that is marking the beginning of this development cycle. Features are still being proposed and discussed . This release allows some early glimpses of whats to come .
To compile GNOME 3.7.1, you can the jhbuild  modulesets  (which use the exact tarball versions from the official release). A slight complication is that gnome-control-center 3.7.1 does not build against network-manager-gnome 0.9.6.2 - see  for details and a patch.
This release is a snapshot of early development code. Although it is buildable and usable, it is primarily intended for testing and hacking purposes. GNOME uses odd minor version numbers to indicate development status.
For more information about 3.7, the full schedule, the official module lists and the proposed module lists, please see our colorful 3.7 page: http://www.gnome.org/start/unstable