KDE 4 will be a major revision of KDE, based on the version 4 series of Qt. Its release date has been scheduled for October 23, 2007.
Faster and more memory efficient, due to the greater speed and efficiency of Qt 4.x and increased efficiency in the KDE libraries themselves.
Reorganized and cleaned up core kdelibs API and rewritten human interface guidelines.
A new default icon theme and visual guidelines, developed by the Oxygen Project, which will make extensive use of SVG.
A completely redesigned desktop and panels collectively called Plasma which will integrate Kicker, KDesktop, and SuperKaramba and is intended to update the decades-old desktop metaphor which defines the modern computing experience.
Streamlined file management and web browsing interfaces in Konqueror.
A new multimedia interface (Phonon), making KDE independent of any one specific media framework.
An API for network and portable devices, called Solid.
A new communication framework (Decibel).
A new default file manager Dolphin
Porting libraries needed by KDE applications for Windows and Mac OS X so KDE applications will easily be ported to these operating systems.
A new spell checking program called Sonnet with automatic language detection.
not to say I don't care about eye candy. Win XP works great to me. For the seen part I'm waiting for KDE 4 
