A patent application filed by Nintendo for a device able to detect objects and be used as a controller of sorts has been made public.
Filed in 2014, the documents were published yesterday and contain a great amount of technical detail on a device that can use cameras and mirrors to read and detect objects around it.
Though similar in appearance to an NFC reader for the 3DS, this device is a new design that can use a camera to photograph and detect the area around it, as well as use a light-source projector. The detection device would also be capable of wireless transmission with a computer. A detailed description of the patent can be found in this NeoGAF post.