In January the GNOME developers have scheduled another the GNOME 2.21.5 development release followed by the first GNOME 2.22 beta on January 30. Two weeks after the first beta is the second beta and another two weeks later is the GNOME 2.22.0 release candidate. The final release of GNOME 2.22.0 is tentatively planned for March 12. If you forgot, it was on March 14 of this year that GNOME 2.18 was release. With GNOME consistently delivering on their six month release cycles, GNOME 2.22 will make it into Ubuntu 8.04 Hardy Heron.
Among the proposed desktop modules for GNOME 2.22 include Vinagre, Gimme, mouse-tweaks, and empathy. You can find additional details on GNOME 2.22 in this Phoronix news posting.