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Contributed by pkmngmr
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The Wii U Gamepad Prototype was composed of 2 pairs a Wii Remotes and Nunchucks attached to the sides of an LCD screen.

They also created a prototype for the Wii U Zapper which consisted of an LCD screen attached to a Wii Zapper.
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Contributed by pkmngmr
In a previous Iwata Asks Interview from 2011, Satoru Iwata stated that the Wii U hardware started development back in 2008. This means it started development 2 years after the original Wii was released, 3 years before it's debut at E3 2011, and 4 years before it's release.
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Contributed by Skarro
The Wii U Mii Maker's music contains the music used for the Great Fairy Fountain in the Zelda series, and Super Mario Bros 3's Water Land.
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Contributed by RayMonkay
If you enter the Wii U's menu on your Birthday, special music will play and all of the Miis will clap for you.
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