GNOME 2.14 and KDE 3.5.2 have been moved to extra. These releases bring quite a big amount of bugfixes, improvements and in the case of GNOME 2.14, speed increases.
During the move several mirrors have been mirroring half of the repository, so expect some missing packages or broken dependencies on some mirrors today.
Upgrading from previous releases should go in a breeze, as far as we know, no special precautions, other than logging out of GNOME/KDE have to be taken.
Please report bugs you find to our dear bugtracker.
Now these two big things have moved to current/extra, normal development can take place again, so expect updates to individual packages that have been outdated for a while now.