It seems that Apple likes the idea of motion sensor technology that they decided to buy it. Watching the success of Microsoft's Xbox Kinect, Apple "paid about $350 million to acquire PrimeSense, an Israeli start-up that developed the motion-sensing technology in Microsoft's Xbox video game console." Not so much given they can use the money they won from Samsung's patent dispute to help pay for it. And with so much cash on hand, they don't even need that.
So the question is when or where will Apple incorporate this newly acquired technology? Will it go into the Apple TV, future iMacs, or all laptops, iPads and iPhones? For that, we will just have to wait for the next Apple announcement.