I would imagine it was to entice sub sales? You look and you see Sorceress, Fisto, Stinkor, Kobra Khan, and Shadow Weaver and those are very popular characters and they all look fantastic. And then you still had the 3 Star Sisters which should have excited most of the POP fans (along with SW). And a couple others Thunder Punch He-Man and Snake Man At Arms, that might not be as exciting.
I really am starting to think they hold back Horde Troopers till the beginning of 2013, and then Ram Man which could be the exclusive or just a draw for the sub next year.