Fedora 12 is now available!! Get it here.
There are some new features in this release, but mostly it's improvements like better graphics support, performance, NetworkManager, OpenBroadcom. For details, see the documentation, or just read the 1-page overview. Also check the list of known bugs if you think you've found a problem - but these should be weird "edge" cases.
I figure I'll probably wait until next week to install Fedora 12 (while I'm away for Thanksgiving) so expect a mini-review then.