Here's what I did...

added:
deb ftp://ftp.debian.org/debian testing main contrib non-free
deb ftp://ftp.debian.org/debian unstable main contrib non-free

to my sources.list

then ran apt-get -t unstable kde

and I think you have to do that too kdm too (maybe even first)

or you can do build dep to cause less errors, I know I got a problem somewhere where I had to uninstall both compeltely then reinstall them, and now I got 3.3 (on Knop 3.4)