ZombiU was on the list so thats all we'll prolly get.
there are more than ZombiU ...basically all the games we've already seen (Batman, Rayman, Rabbids, etc).
Safest assumption: we will hear NOTHING new about Wii U from Gamescom. Don't expect anything. Nintendo is gonna be the one revealing new stuff in their Nintendo Direct or pre-TGS thing (those two might turn out to be the same thing). At this point, I'm not expecting any third party to announce something until AFTER Nintendo had their Date & Price event.