I plan to get a Wii U next month as well. This is what I will buy in the next few months. The bolded are must haves for me:
- Pikmin 3
- Super Smash Bros U
- MK 8
- Wonderful 101
- 3D World
- Windwaker HD
- Zombii U
- MH3U
- Kirby and The Rainbow Curse
- Donkey Kong Country: Tropical Freeze
- Captain Toad
- Bayonetta 2
- Hyrule Warriors
That should last me until Xenoblade X and Zelda U release, although I have plenty of 3DS and PC games to play as well.