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
Photos emerge of Wii Remote and nunchuck prototype for GameCube
IGN Builds a Custom Wii 2 Prototype, Compares Graphic Capabilities - Zelda Dungeon
Prototype Wii Remote Accessory for Nintendo GameCube Surfaces - YouTube
/cdn.vox-cdn.com/uploads/chorus_asset/file/13346731/GCremo5.png "Original Wiimote prototypes photos show cool, if subtle, changes - Polygon")
Original Wiimote prototypes photos show cool, if subtle, changes - Polygon
Prototype Wii Remote | BitBuilt - Giving Life to Old Consoles
Nintendo Gigaleak Reveals WiiMote Early Design, Wii Virtual Console, 'Pokemon Diamond and Pearl' Prototype | Tech Times
CV | Nintendo Wii Revolution Prototype Controller
Photos emerge of Wii Remote and nunchuck prototype for GameCube
Wii Prototype Controllers WORKING on GameCube Dev Hardware - YouTube
Nintendo Wii Prototype, Debug & Sample Hardware
Nintendo Wii 2 'Project Café' prototype video leaks | TechRadar
Iwata, Miyamoto, and the Wii Wheel Prototypes | WIRED
Wii U Gamepad Prototype vs Product – SideQuesting
Cabel on Twitter: "A wild prototype Nintendo Wii. The Wii Remote isn't wireless, but connects via coax!? Neat. It sold for ¥61,000 ($590) https://t.co/3chQPwjh8L" / Twitter
Early Wii-U Prototypes - Wii U Wiki Guide - IGN
James Montagna on Twitter: "Here's a more advanced Wii Remote prototype. Overall, they're wider than the final Wii Remote + not as long. The B button is flat, and not hooked like
Prototype Wii Nunchuk Controller Included A Rumble Motor, According To New Photos | Nintendo Life
Original Wiimote prototypes photos show cool, if subtle, changes - Polygon
Iwata Asks: Wii U GamePad prototype was two WiiMotes taped to a monitor | VG247
Check Out This Early Wii U GamePad Prototype - IGN
Fan's GameCube may actually be an early Wii prototype used at E3 - Dot Esports
