Hi,
this breakage happened because we switched pykde4 to dh_python2 before python-qt4. Aptosid devels, if you want to fix system-config-printer-kde without breaking other things at the same time, you may want to read these bug reports and include the patches attached there:
http://bugs.debian.org/cgi-bin/pkgreport.cgi?users=debian-qt-kde@lists.debian.org&tag=dh_python2-qt4
If you decide to include these patches, do it at your own risk. If you have any question, just ask.