Welcome to the new GNOME development cycle! Please fasten your seat
belt: you're going to see a lot of exciting new changes!, new features!, new bugfixes!, new translations!, new documentations!. Lots of modules have great plans for 2.16 and if you're willing to help, there's a lot of areas where you'll be heartily welcomed! Don't hesitate to ask how or where you can help. If you don't even know where to start, just send a mail to our fantastic gnome-love mailing list.
This is our first development release on our road towards GNOME 2.16.0, which will be released in September 2006. And I can tell you that GNOME 2.15.1 tastes good. Go download it. Go compile it. Go test it. And go hack on it, document it, translate it, fix it.
Full Announcement [2].