I will try to shed some light on this problem for you. First, as far knowing in advance whether a game will support keyboard and mouse use is hit or miss. But when the game is released it will usually tell you on the back whether or not it will support a certain device. Sony has no control over third party software, so they would not be able to tell you about a certain game. Since the PS3 has been out for a short time it is hard to say if any games will support keyboard, but I would guess that it would. As far as taking the game back for Call of Duty I would make sure that it has the keyboard use that you want. As someone who has several games on different systems I can tell you that just because it is out on the PC doesnt mean that it will be playable with a keyboard on a console.