Comparing the aesthetics of the Wii U along with pictures of the 3DS is a good way to remind people of what's in store for the future of Wii U. Taking a technical and philosophical look at the 3DS can give you many clues as to what to expect for the future Wii U gamer.
The 3DS has significantly improved online download and entertainment features, it operates on a significantly upgraded graphics system, it now delivers more of the type of games only developed for other consoles, and it incorporates more motion sensing technology along with an improved AR feature. A camera feature is very much integrated with the system and the social integration is significantly improved. It's only direct competitor, the PS Vita is significantly more powerful and feature rich but will never surpass the high sales figures of 3DS, which clearly proves that higher specs and more bells and whistles don't guarantee success.
These should all be things you have and will see with the Wii U system, which means that the Wii U will most likely outsell the new Xbox and PS4 or Omni system.