The KDE Community proudly presents the second Beta release for KDE
Since the libraries were frozen with the first beta, KDE developers have been adding features and functionality to their applications. Now it is time to start polishing these features; writing and translating documentation, improving the usability, and completing the artwork. As KDE 4.0 is feature-frozen now and going full on into bugfixing mode, major ideas and changes will be held off until KDE 4.1. However, some KDE components, such as Plasma, are exempt from this freeze and will still see significant
The info page has more information, including information on how to obtain KDE 4.0 Beta 2.