When I sat down to make this list, I was surprised to see how many games I was actually interested in for the remainder of the year. I most certainly won't be picking them all up at launch, but considering the length of some of these games, I'm sure I'll always have something to play. This list doesn't even include eShop or the 3DS purchases.
Pikmin 3
New Super Luigi U (Pre-ordered)
The Wonderful 101
Donkey Kong Country: Tropical Freeze
Super Mario 3D World
Wii Party U
Assassin's Creed IV
Watch_Dog
Splinter Cell: Blacklist
Batman: Arkham Origins
Rayman Legends
On a side note, and at the risk of derailing this thread, I really want a unique online FPS for the Wii U in the vein of something like Goldeneye 007 (on the Wii). I say "unique" because it was developed for the system, wasn't a war-themed shooter, and was actually good. The online play was simplified compared to COD and I found it be to more fun and addicting as a result.