TIL The prototype wiiu gamepad has circle pads : r/wiiu

Nintendo Wii U experience it all.

Wii U controller is officially the Wii U GamePad - Vooks

Nintendo Wii U Prototype Gamepad - Consolevariations

QA Tweets Photo Of Revised Wii U Controller - My Nintendo News

Wii Hardware

Wii U GamePad - Wii U Guide - IGN

Wii u gamepad touch pad problem : r/wiiu

Wii Hardware

Wii U titles with dual GamePad support won't be available at launch, says Nintendo - The Verge

Original Wii U Design Used Analog Sticks Instead of Circle Pad? - Rumor - Nintendo World Report

Wii U GamePad - Wii U Guide - IGN

Wii U (Platform) - Giant Bomb

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