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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File:Wii E3 2006 (front left angle).jpg - Wikimedia Commons
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![Nintendo Kicks Off E3 With Wii U GamePad and More [#E32012] – G Style Magazine](https://i0.wp.com/gstylemag.com/wp-content/uploads/2012/06/Wii-U-GamePad1.jpg "Nintendo Kicks Off E3 With Wii U GamePad and More [#E32012] – G Style Magazine")
Nintendo Kicks Off E3 With Wii U GamePad and More [#E32012] – G Style Magazine
Wii U: Nintendo unveils its new console at E3 2011 | E3 2011 | The Guardian
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