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
Designing the New Nintendo Wii U Gamepad - 3D Printing Industry
Prototype photos show an early look at the Wii U GamePad – Destructoid
Wii U - Wikipedia
Iwata Asks: Wii U GamePad prototype was two WiiMotes taped to a monitor | VG247
/cdn.vox-cdn.com/uploads/chorus_asset/file/10936593/new-wii-u-gamepad-official-verge.0.jpg "Nintendo at E3: Wii U, Pro Controller, 'Miiverse' online services, and new games - The Verge")
Nintendo at E3: Wii U, Pro Controller, 'Miiverse' online services, and new games - The Verge
Close-Up Look at the Wii U Controller (E3 2011) - YouTube
![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
Nintendo WII U GAMEPAD CONTROLLER ONLY WUP-010 white Black japan Please Read | eBay
The Nintendo Wii U: Virtual Reality Gameplay Prototype? | The Red Rings of Redemption
New Kickstarter project aims to make a Wii U GamePad for everything - NintendoToday
Wii U GamePad | Nintendo | Fandom
Is This A Redesigned Wii U GamePad In Latest Mario Kart 8 Japanese Commercial? - My Nintendo News
Check Out This Wii U GamePad-Like Controller For Other Consoles - My Nintendo News
Check Out This Early Wii U GamePad Prototype - IGN
Nintendo Wii U GamePad Comparison: Before & After E3 2012 - YouTube
WiiU Gamepad Redesign on Behance
Twitter 上的Nintendo4Life87："This is a very rare WiiU prototype gamepad (DK2-E3-CD(W)) that was demonstrated at the E3 in 2011 to reveal the new console. https://t.co/bRrFuK0YXb" / Twitter
Nintendo unveils the Wii U system - CNN.com
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
/cdn.vox-cdn.com/uploads/chorus_image/image/4625455/tall-gamepad.0.jpg "Nintendo's early Wii U experiments revealed - Polygon")
Nintendo's early Wii U experiments revealed - Polygon
Rumor: Nintendo working on cartridge for 3DS to allow Wii U control - NintendoToday
Early Wii-U Prototypes - Wii U Wiki Guide - IGN
TIL The prototype wiiu gamepad has circle pads : r/wiiu
Community - Retro - Hardware - Prototype Wii U Gamepad I recently procured. | NeoGAF
Wii U, the new Nintendo console, reinvents the controller - CSMonitor.com
Wii U GamePad | Wii u, Wii, Industrial design sketch
