I know it's not indie, but I'm currently going through Pushmo World and it's super enjoyable! I don't really have any indies on my 3DS, either. But I'm really warming up to the scene and want to get more involved in it. I just need to get an external HDD for my Wii U and I'll be set.
As for upcoming Wii U indies, I'm really anticipating Bizerta: Silent Evil, FAST Racing Neo and Yooka-Laylee.