Rex, sorry it was a mistake, I though the kdelibs was linked against libudev.so.0 instead of libudev.so.1, but I was wrong, it was an old package that was not removed by fedup.
Sorry for the confusion!
Removing blocker status as Fedora 18 status has been declared as Go to clean up the list of proposed blocker bugs. As all the bugs are marked as fixed, I'm closing this bug.