KDE 4.0 Beta 1 is out, and KDE Four Live has been updated with the new release. Download the ISO and check it out.
KDE 4.0 Live April Snapshot Screenshots
KDE Four Live
One of the KDE devs has released LiveCDs with a preview of the upcoming KDE 4.0 desktop named KDE Four Live. KDE 4 is currently pre-alpha status, so, uh, don’t put it on a production server.