The first alpha release of KDE 4.1 isn't planned until the end of April, but this past weekend the OpenSuSE team had updated their KDE Four Live spin against the latest KDE 4.0.66 snapshot packages. The KDE 4.0.66 development packages contain new Kickoff and Plasma features along with much other work to the numerous packages that will ultimately make up this first major update to KDE 4.
Hopefully a Kickstart replacement like Raptor or Lancelot, Kaffeine (Dragon Player is not as good imho), KOffice2 (with KWord and Krita, which are candidates not to be in the 2.0 release) will be finished for the KDE 4.1 release, too.
Have they expanded the user preferences and interface options? I was exceedingly disappointed by them in KDE 4.0. If developers are worried about confusing people with too many options, just make an option that alters what level of configuration you get.
As someone who has been using Enlightenment since 14.2 but grows tired of waiting on e17 fixes, it almost causes mental breakdown when I can't set my preferences to something so intelligent or have to switch to something noticeably slower. With a 3.4 GHz Core 2 Quad, I should not ever notice any interface as slow, except for possibly waiting on useful animations.