It hasn’t been too long since openSUSE 12.2 came out, but the show must go on, and development of openSUSE 12.3 has officially begun. While the team are waiting to finalise a release schedule at the openSUSE Conference later this month, this hasn’t stopped them from releasing a Milestone 0 in the mean time.
The Milestone 0 is testing out mostly updated software from 12.2, this includes using Linux Kernel 3.6 (albeit RC 7 for now), updating KDE to 4.9.1, Glibc to 2.16, X.org to 1.13, Qt to 4.8.2, and a handful of other updated packages as well.
Again, the devs wish for as much community involvement as possible, especially after the troubles that delayed the release of 12.2. You can grab the beta from the openSUSE download center.