The Other Asylum of the Daleks Prequel
Apparently there was another prequel to Doctor Who: Asylum of the Daleks.  It was only available to season subscribers on iTunes and Amazon in America.  It has now been released into the wilds of the YouTubes and Interwebs.  I can only assume that it will be included on the DVD/Blu-rays.  Here is is for your viewing pleasure.
http://youtu.be/Q1r2dQkB1fY