It has been a little more than a month since you were able to install the latest and greatest KDE on release day. Today is another one of those with KDE 4.2.1 (codenamed "Cream") hitting the shelves.
Today, the KDE team announces the immediate availability of KDE 4.2.1, which is a recommended update for everyone running KDE. (If you are still on 3.5, do consider again upgrading to KDE 4.) 4.2.1 has a nice changelog for those that want to read something while packages are being downloaded.
As usual, this release does not contain exciting new features but stabilizes the 4.2.0 release further. A month worth of feedback and bug fixing surely pays off. Also, those dot-releases bring updated translations for the 50-odd languages KDE desktop and applications are shipping in.
If you are running this release with Qt 4.5 and you're encountering problems, please let the developers know by means of bugs.kde.org so those kinks can be worked out for everyone (including yourself).
The KDE team wishes you a lot of fun and productivity with this release and goes back to hacking on the next KDE coming this summer. In the meantime, roughly once a month we'll keep pushing out the latest bug fixes and updates through this kind of dot-releases to the user.