Most probably Sony knows motion controls lost their initial hype and now people just accept them when they make sense. So the plan could be to just keep Move alive until it gets cheap enough to be bundled with consoles, starting since PS4 or the last revisions of PS3. PS4 should most probably receive a new version with a camera with depth detection, like Kinect, allowing hands-free games too with more possibilities than the original Eye Toy, by 2013 those cameras should be cheap enough. From then on devs could just choose whether use motion or classic controls or both, depending on which are most suitable, without having to worry about split user bases. Porting of motion control games from and to other platforms would become almost trouble free too.
Stwike him, Centuwion. Stwike him vewy wuffly! (Pontius Pilate, "Life of Brian")
A fart without stink is like a sky without stars.
TGS, Third Grade Shooter: brand new genre invented by Kevin Butler exclusively for Natal WiiToo Kinect. PEW! PEW-PEW-PEW!