I'm very curious about what content will actually be in the Wii U version.
The 3DS version does seem to have a lot of single player foucsed content, would be a real shame if the Wii U version does not have this and comes out as a more bare bones version.
They haven't really shown anything substantial about the Wii U versions content as far as I know, kinda odd.
In a recent update, Sakurai did say that the 3DS' Challenges were more on the easy side, and the Wii U's version will be more difficult. That's as far as he's gone on that regard though. More trophies in the Wii U version is a given, though.