Its developers describe KDE 4.0.0 as having "embryonic concepts" which would be leveraged into a in successive major releases. , but 4.2 was always going to the first "real" KDE 4 release.
Since 4.1 the project has had more than 62,400 commits by some 600 contributors.
KDE 4.2 is seen as the "positive results" of the KDE 4 beginning and is not the end, but another milestone along the road of KDE 4 development.
Plasma: it's all about the desktop
The KDE desktop shell, Plasma, has received a good makeover and includes many new widgets for uploading files to Web applications, system monitors, weather information, file previews and even a simple Web browser.