Sony filed patents last year for tech that would allow two or more users to share an offline, multiplayer game without the need for the traditional split screen. Slipping into our professor hats for a moment - 3D systems typically work by rendering two images on screen at once, sending one to each eye. It takes only a slight reworking of this tech to be able to send two separate images to each player, rather than each eye, thereby eliminating the need for split-screen (and ensuring that multiplayer games can never be a spectator sport again).
Check out the patent here. Sony posit several uses for the tech, one of which shows three friends able to watch "Seinfeld", "Jeopardy" and "Dragon Tales" at the same time on the same television - a futuristic pipe-dream we've all clung to since the early 90s. The citing of these shows, if anything, suggests that Sony have been sitting on this one for a while.
The patent was published last week, and spotted by Broke My Controller. Rumours that this tech only works "if you believe in it" are unfounded.