I've played both the PC Demo and PS3 Full Game (Tested on Shangri-La) with Mouse and Keyboard, I can see no obvious differences between the two other than the PC being able to go to higher resolutions. Mouse and Keyboard surprisingly feels the same on both, tested with an Apple Keyboard and MS Intelli V3 Mouse.
Is it a revolution in Console Gaming? No because you could play Quake3 on Dreamcast with Mouse and Keyboard, and also I'm not a big fan of differing control methods on the same platform, the mouse/keyboard players are going to pwn those on pads. At least you can go on a 'Pad Only' or 'Keyb/Mouse Only' Server should you wish.