Since yesterday the KDE SC 4.5 Beta 1 packages are available through the openSUSE OBS. They are available in the KDE:KDE4:UNSTABLE:Desktop repository. As announced, this Beta contains the KDEPIM packages from KDE SC 4.4 due to the delay in the conversion to Akonadi. However if you feel really brave, then also the KDEPIM 4.5 packages are available in a subproject (KDE:KDE4:UNSTABLE:Desktop:kdepim45).
The kdepim45 packages will receive daily updates from svn, while the KDE SC 4.5 Desktop will receive weekly updates. Once openSUSE 11.3 has been released, KDE SC 4.5 will be moved to the KDE:KDE4:Factory:Desktop repository.