Although it just recently received its public unveiling, Nintendo's main man Satoru Iwata revealed in an interview with industry site Gamasutra that the underlying concept behind Wii U dates back to 2007, almost immediately after Wii was released.
Iwata said the company mulled over various ideas, one of which described a dual-purpose approach -- having the Wii U controller work in tandem with the console, but also as a standalone system[...]
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