If you are currently running KDE 4.2
, get ready, as KDE 4.2.2 has just been released. KDE 4.2.2 is a point release that incorporates many bug-fixes and in particular it incorporates stability fixes in KRunner, performance enhancements in KMail, and various optimizations to KHTML. The KDE 4.2.2 release announcement can be read at KDE.org
The next major release of the KDE 4 code-base is KDE 4.3 and it is due out this summer.