Nintendo Land - I love the idea of Nintendo releasing games to show the capabilities of the system at launch. I'll probably play Nintendo Land more with my wife and friends than any other game on the system (until they release NL DLC or Nintendo Land 2 comes out)
NSMBU - Mario brought me into gaming with the first SMB and a new 2D mario is always a wonderful nostalgic trip to my childhood
ZombiU - It looks like the best 3rd party game by a long shot. I can't wait to tremble in fear as I slowly proceed. The fear of knowing death lies around the next corner is wonderful. (Bring Dark Souls 2 to WiiU please)
Batman: AC - I've wanted to play the first since it released. I've been holding off for this version since it was announced.