I tested the LiveCD and it still isn't worth looking at. The new oxygen style development has just begun (there was a better looking "old" oxygen style before from what I've been told) and it doesn't look really good at the moment (but the icons do!), the new panel isn't in and applications are buggy and some features are not integrated yet. But KDE > Gnome, so I can wait for the final version and I am sure it will rock and bring some Gnome users to KDE
Btw. it seems that Debian/stable (Lenny) will be getting KDE4 as default before Kubuntu does. Kubuntu will support it as the default desktop by 8.10 as far as I know.