I've compared the prototype E3 gamepad against the retail version. Nintendo did make some changes after the E3 in 2011 when they exhibited the console. : r/wiiu
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/cdn3.vox-cdn.com/uploads/chorus_asset/file/7916109/Screen_Shot_2017_02_02_at_16.06.36.png "This picture of the Nintendo Switch and Wii U is kind of mind-blowing - The Verge")
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