The 3rd development snapshot of KDE4 has been released and packaged for Kubuntu.
There seems to be a mistake in the
/etc/apt/sources.list line they propose:
Actually it should be
deb http://kubuntu.org/packages/kde4-3.80.3/ edgy main
as it gives a 404 Not Found error otherwise.
I do not plan to download 104MB on my slow connection this evening, but I’ll give it a try tomorrow. Good luck to you if you want to try it too!