Has a new Wii U GamePad been inadvertently revealed in a recent Japanese advert for Mario Kart 8? Eagle-eyed readers over at MyNintendoNews certainly think so and as such they flagged the mysterious device, which you can see via the blurry, out-of-focus picture attached below. Are Nintendo about to reveal a new, less-chunky GamePad for the Wii U? We'll have to wait and see...