After the disappointments of 3DS that has no patent for 3D, from the NeoGAF forum, December 31, 2009, Sony filed a patent that would be very close to the U and the Wii pad. Indeed, the patent refers to a device acting as a pad planned for the PS3, which will carry a back cover touch sensor and front will also use augmented reality (much like the Vita). But if you look at the video below or the patent, in design, this pad is very similar to the U Wii and the patent dates back to late 2009, it could be that Nintendo was inspired by Sony features.It seems that Sony has the cards and that if he wished, he could eventually strike back against on the grounds that patent, which would mean that Sony can get money for every Wii sold or delaying U out of the home console future of Big N. While plagiarism or not, you be the judge.

Can't see the first two pictures.