According to this article PS3 Gamers will be able to play with Keyboard / Mouse or PS Move.
http://www.joystiq.com/2011/08/26/counter-strike-global-offensive-to-have-cross-play-for-ps3-pc/
I’m psyched. I thought they might wait until next gen came out to release it on consoles.. it’s about time they stop calling ps3 / xbox next gen consoles. Also the article states the game won’t be coming to XBOX.