I can confirm this. Using i386 architecture.There's a lot of problems with dependencies if you trying to do a clean install of KDE 4.2 on a clean Debian unstable.
Using command: aptitude install kde4It will try to install package "google-gadgets-common" - but this requires package "libltdl3", which is not available in unstable.
In unstable you have a newer version - "libltdl7". And that's the problem i think. Sorry for my bad english :)