I didn't realize the rights to the Daleks were separate from the rest of Dr. Who. I swore I'd seen the Daleks in the ads for some of the IDW comics.
You may have, though I can't think of any appearances of Daleks in IDW ads off-hand.
The most recent series of Doctor Who Classics
went on an unexpected hiatus of several months length right as it was about to print "Nemesis of the Daleks." It eventually came out. I wonder if the Daleks were the reason. IDW, for instance, never reprinted the Abslom Daak stories.