If the Wii was a GameCube with a motion controller, NX will be a Wii U without the gamepad, but this time, they will use cheaper and easier to make components, not as customizable as past gens. Soundwave mentioned an interesting idea to use mobile chips in order to scale the software output between devices.
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Number ONE Zelda fan in the Universe
Prediction: No Zelda HD for Wii U, quietly moved to the succesor
Predictions for Nintendo NX and Mobile