GNOME 2.15.1 has been released. As with the Linux kernel, odd-numbered releases are developmental releases; meaning that 2.15 is the developmental branch for 2.16. You can compile it using these jhbuild modulesets (or use GARNOME). Detailed notes on the release can be found here: platform, desktop, admin, and bindings. On a related note, Dropline GNOME 2.14.1 has been released as well.