From the “If it’s good enough for Linus” files:
KDE 4.3.0 Beta 1 is now available for testing and there sure are a whole lot of new things to look at on this Linux desktop GUI. While KDE 4.0 when it was first released showed lots of promise but plenty of flaws, both KDE 4.1 and 4.2 have made some significant improvements.
With KDE 4.3.0, developers are going even further with more bug fixes and of course more features. At the top of the list for me is something called Policykit integration. Policykit basically enabled a better degree of control over a user desktop.
The KDE 4.x series is also known for its “eye candy,” and the 4.3 Beta is no exception with new window animations, and improvements to the Plasma desktop interface and KWin window manager.
From my point of view, though, it’s really about usability…