I've finally decided to get one after E3. Mega Man being in Smash Bros. pretty much sealed the deal for me, and the new 3D Mario and Mario Kart look really good too. I'm also looking forward to the new Donkey Kong Country, although I was disappointed that it turned out to be Retro's top secret game they've been working on, rather than a Star Fox sequel.
I'm not planning on buying a new Wii U though...I'm going to try to get a good deal on a slightly used one off of Ebay or Craigslist.