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
What to expect from Nintendo at E3 2012: Wii U, 3DS, and a sense of purpose - CNET
/cdn.vox-cdn.com/uploads/chorus_image/image/1946403/new-wii-u-gamepad-official-verge.0.jpg "E3 2012: Wii U coverage - Polygon")
E3 2012: Wii U coverage - Polygon
/cdn.vox-cdn.com/uploads/chorus_image/image/6989023/screen_shot_2013-01-23_at_8.46.01_am.0.png "New 3D Mario, Mario Kart, Wii Party titles in development for Wii U, will be shown off at E3 2013 - Polygon")
New 3D Mario, Mario Kart, Wii Party titles in development for Wii U, will be shown off at E3 2013 - Polygon
E3 2012: Nintendo Unveils New Details Surrounding Wii U – The Hollywood Reporter
Nintendo Wii U E3 2011 Hands-On Preview | GameGrin
Final Wii U Form to Be Shown At E3 2012 | Nintendo Life
E3: Hands-on with the new Nintendo Wii U GamePad - Movies Games and Tech
Wii U E3 2012 Infographic - My Nintendo News
Nintendo Wii U console shown off in its bright, minimalistic entirety | Engadget
E3 2011: Wii U tablet limited to one per console - GameSpot
File:Wii U controller E3 2011.png - Wikimedia Commons
Nintendo E3 Presentation Summary
File:E3 2011 - Nintendo girl holding the Wii U controller (5831893934).jpg - Wikimedia Commons
E3 Split Prediction: Nintendo Will (Or Won't) Rebrand The Wii U - Game Informer
Wii U controller images leaked online ahead of E3 2012 | Technology News
![Nintendo Wii U Hands-On At E3 2011 [Video] - SlashGear](https://www.slashgear.com/img/gallery/nintendo-wii-u-hands-on-at-e3-2011/intro-import.jpg "Nintendo Wii U Hands-On At E3 2011 [Video] - SlashGear")
Nintendo Wii U Hands-On At E3 2011 [Video] - SlashGear
E3 2011: Nintendo Wii U - All You Need to Know, Video and Photos Included
E3 2012: Wii U GamePad revealed by Nintendo | Wii U | The Guardian
Nintendo Wii U Trailer (E3 2011) - YouTube
Wii U: Nintendo unveils its new console at E3 2011 | E3 2011 | The Guardian
Hands On the New Nintendo Wii U at E3 | WIRED
