openSUSE 12.3 Milestone 1 GNOME 3.6
The Green Team has released openSUSE 12.3 Milestone 1 and it does include GNOME 3.6 as expected. openSUSE 12.3 is code named Dartmouth. Since openSUSE favours green colour 12.3 is probably named after the colour "Dartmouth Green". Dartmouth is currently scheduled for release around March 2013.
Booting from Live USB
I downloaded the Live ISO from the Development page and then used SUSE Studio ImageWriter to prepare a bootable USB flash drive. I prefer using torrents for downloading ISO files as all the downloaded files can be hash checked once they are downloaded using the torrent client itself. This ensures that the ISO is intact and not corrupted. Finally i tweaked my BIOS settings and made flash drive as the default boot device. I hit F10 to save the BIOS settings. I plug-in my flash drive and boot my system and i select the "Live CD" option in boot menu in order to boot from the Live ISO.