Theory: Wii U is part of the fusion concept and will be around longer than we think.

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http://www.gamespot.com/articles/nintendo-s-next-console-and-mobile-will-be-like-brothers/1100-6417496/

"While we are only going to be able to start this with the next system, it will become important for us to accurately take advantage of what we have done with the Wii U architecture," Iwata said. "It of course does not mean that we are going to use exactly the same architecture as Wii U, but we are going to create a system that can absorb the Wii U architecture adequately."