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
E3 12】米国任天堂社長「Wii U、2つのゲームパッド使用」 | レスポンス（Response.jp）
Nintendo All-Access Presentation @ E3 2012 - YouTube
:format(jpeg)/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
Nintendo Wii U E3 2011 Hands-On Preview | GameGrin
File:Wii U controller E3 2011.png - Wikimedia Commons
任天堂の次世代機「Wii U」、E3 2011で見た第一印象 - CNET Japan
Nintendo reveals new Wii U details ahead of E3 | Ars Technica
E3 2011: Wii U tablet limited to one per console - GameSpot
西川善司の3Dゲームファンのための「Wii U」講座 Ver.E3-2012 - GAME Watch
E3 For Families: Nintendo's Wii U | WIRED
Final Wii U Form to Be Shown At E3 2012 | Nintendo Life
File:Wii U controller E3 2011 2.jpg - Wikimedia Commons
E3 2011］さっそく「Wii U」を触ってみた！ タッチスクリーン搭載のコントローラによって遊びの幅が大きく広がる予感
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
The Nintendo Wii U Won E3 2011 | TechCrunch
E3 2011: Nintendo Wii U Preview
Nintendo Announces The Wii U At E3 | TechCrunch
Nintendo's Changing the Media Game at E3 - Talking Point | Nintendo Life
![Nintendo Wii U Hands-On At E3 2011 [Video] - SlashGear](https://www.slashgear.com/img/gallery/nintendo-wii-u-hands-on-at-e3-2011/Nintendo-Wii-U-E3-hands-on-01-SlashGear--580x327.jpg "Nintendo Wii U Hands-On At E3 2011 [Video] - SlashGear")
Nintendo Wii U Hands-On At E3 2011 [Video] - SlashGear
/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
E3 2014: Connecting Star Fox on Wii U with Project Guard and Project Giant Robot - GameSpot
Hands On the New Nintendo Wii U at E3 | WIRED
E3 2011: Nintendo Wii U - All You Need to Know, Video and Photos Included
ASCII.jp：任天堂、E3でWiiの後継機「Wii U」を発表！【E3特報】
A quick walk through Nintendo's E3 2013 Wii U lineup | Engadget
