N3DS uses part of this patent, head tracking already exists to enhance the 3D experience
http://www.Nintendo.co.UK/games/OMS/new-Nintendo-3ds/whatsnew.HTML#viewing
These patents reflect research and development underway, but all will can be not used, deduce that this will be the weapon of the NX remains a hypothesis... the fact that its patent is made a day comes may be work on 3DS...