Firingsquad reports Sony filed two patents for a stereoscopic successor to split-screen multiplayer gaming:
Broke My Controller stumbled upon two patents for "stereoscopic screen sharing" recently filed by Sony Computer Entertainment, Inc. which outline the usage of current 3D technology in a slightly different configuration. By alternately rendering two separate characters' viewpoints on the screen and then filtering these images to each player through stereoscopic glasses, you could have all the benefits of split-screen without any of the drawbacks. No more cheating by looking at the other player's screen, and no more cutting down or distorting the field of view by cramming two of them onto the same TV.
The diagram for the LCD shutter glasses also includes what appears to be a pair of attached earbuds, which could mean that Sony intends to give each player their own audio feed, as well.