Sounds like you already have the majority of the good games out for the Wii U.
I'm really disappointed that Nintendo didn't also release a version of SM3DW on the 3DS as well. That game looks like it's a lot of fun. I've always been a sucker for SMB2. So I was really excited that they kinda paid homage to that one by bringing back everyone's special abilities.
Windwaker is one of my favorite Zelda games. The HD remake looks just amazing! So that would probably be one of my first purchases if/when I do finally pick up a Wii U. I might pick one up at around tax return time. If I can get one for a decent price.