Not too long ago, there were rumors of a new Wii-like PS3 controller that could break apart, depending on what kind of game it was being used on. Well, looks like those rumors have turned into a patent, recently filed by a Gary Zalewski from SCEA. The break-apart controller emits an ultrasonic beam of sound and light, which can be interpreted by the PlayStation Eye to track your movement. This would effectively emulate the Wii's motion sensing, without potentially infringing on any of Nintendo's copyrights.
Whether or not this device will come to fruition is unclear. Not all patents become real-world devices. This could be PS3 tech ... or maybe even PS4 tech.