While Sony has not come forward with complete CPU footprint information, they've stated that PlayStation Move requires an "insignificant" 1-2MB of RAM. That's basically nothing, which should mean that processing resources aren't the reason PlayStation Move would or wouldn't be supported by a given game, which should mean that we'll see Move supported in more titles.
But like we said, CPU processing has plenty to do with Move's digital footprint, too. And just because the Move's output can be processed in "under a frame" doesn't mean the graphics, physics and overall experience of said frame aren't diminished. [Joystiq]