Here’s a bit of an interesting rumor: it seems like Nintendo is working on a 3DS cartridge to pave the way for a 3DS to Wii U stream, y’know, like how the Game Boy Advance could sync up with the GameCube via Link Cable. The potential? Along with the Circle Pad Pro, the 3DS would be able to act almost exactly like a Wii U Gamepad, as the 3DS carries an accelerometer, gyroscope, the basic circle pad, d-pad, A/B/X/Y/, Home, Start/Select buttons, and, with the Circle Pad Pro, the second circle pad and the second set of L/R buttons (ZL and ZR). This could potentially save people quite a bit of money when multiple Wii U GamePads are supported in future games, as people with 3DS systems will simply need to purchase this handy little cartridge.
Keep in mind, however, that this is just a rumor. Currently, the Circle Pad Pro is a GameStop exclusive, so, if this cartridge were to be released sometime in the coming months, it would also probably be a GameStop exclusive as well. Of course, if you may direct your attention to the picture above, there was a patent filed by Nintendo on a working cartridge attachment for the DS back in 2010, probably aimed for DS to Wii interaction. Nevertheless, it is not news that Nintendo is working on a much more integrated 3DS to Wii U relationship, as the next Super Smash Bros. is set to release on both consoles, with features speculated to appear when both versions are connected.