Nope, only 4 I think.
Well, I am not too worried about PC since by the time it is out PC would be getting slightly better, and and it is a matter of time when your PC can run the game in Max settings. But most PC would be ok with it with reduced effect. That and porting from 360 to PC is like a piece of cake.
Now, PS2 I am worried about, since any gamer's PC would do way better than your PS2.