(Thanks to Siliconera for the image)

A new rumor on a French Nintendo fansite has popped up stating that Nintendo is working on a new cartridge prototype that will allow streaming between the Wii U and the Nintendo 3DS. This cartridge will allow the Nintendo 3DS to function as a second Wii U gamepad when paired with the Circle Pad Pro, which is a 3DS accessory that gives an extra analog stick.

This news is especially promising considering just two years ago, Siliconera unearthed