Highlights of the release include a Qt 4.6 package and KOffice 2.1.0 (however, in line with upstream, KOffice 2.1.0 is primarily intended for testing rather than production use). Konversation 1.2.1 and KTorrent 3.3.1 are also included. Older packages from the SC 4.3 series should be binary compatible, allowing you to choose which packages you would like to upgrade to the latest versions.
You can install KDE applications on your Windows platform using the latest installer (Windows executable). Please remember that KDE software on Windows is still a work in progress, so applications can be unsuitable for day to day use at the moment.