Play indie games
The Wii U has a nice selection of downloadable indie games at launch. There are only three, but in the grand scheme of things that means that over ten percent of the Wii U's total games right now are downloadable indie titles.
Between Trine 2, Little Inferno, and Chasing Aurora, there's definitely something for every indie game fan on the console right now. And they're priced accordingly, as well.