PS3 will support bluteeth mice or keyboard, or usb connection.
As for the game...
It plays much like reskinned Oblivion. Character here needs items from other side of map sort of thing. The items and scenes are excellent, the movement of the NPC's and opponents is a little stiff.
I do like the idea that you choose your role of good or evil, much like Deus Ex, it determines final outcome.
Once you figure out that you NEED to use R2 for effective combat its much easier to play. I used scoped .44, and sniper rifle exclusivly, and took down every opponent with them easily. I was a little disapointed that the game ended when it did, and I wasn't able to finish the rest of the world. I'm replaying now from an earlier save.
I played 'good' on the first way through, I'm going to try it again as evil.
John C.