Physical:
Darksiders II
Pikmin 3
Wii Party U
Nintendoland
Super Mario 3D World
DKC: TF
Digital:
TLoZ: WWHD
Wii Fit U
Nes Remix
Also considering getting Dr. Luigi.
It's hard to keep the rhythm of the games when you got your 3DS five months before the Wii U.