Greg Kroah-Hartman has announced the availability of KDE 4.8 in openSUSE Tumbleweed. Greg writes on a mailing list, "After 2+ weeks of messing with KDE 4.8 to get it to build and work properly in openSUSE:Tumbleweed:Testing, all seems good, so it's starting to show up, slowly, in openSUSE:Tumbleweed this weekend."
Seasoned openSUSE users are aware that it's a very bad idea to mix repos. Greg warns, "...I know a lot of people mix the KDE:4.8 repo with Tumbleweed on their systems, and that might cause problems if the KDE repo is allowed to remain as packages get duplicated."
So, if you have KDE:48 in your repo list, it is suggested that you remove it.
For the nex openSUSE users, Tubleweed is a 'rolling-update' version of openSUSE which keeps latest packages versions of all software instead of relying on rigid periodic release cycles. The project does this for users that want the newest, but stable software.
You can read more about Tumbleweed here.
Greg KH himself maintains Tumbleweed. Tumbleweed is not recommended if you are using proprietary drivers for your hardware as it is understood that companies who be able to provide drivers for a rolling release.