One of the most alluring features of Valve's upcoming Counter Strike: Global Offensive was its support for cross-platform multiplayer between PC and PlayStation 3 players. Sadly, this feature has been cancelled.
The cross-platform play was not cancelled because it was unfair for controller-wielding PS3 players to compete against PC players with their keyboard + mouse controls. The real reason behind the decision was because Valve wanted to update the game as often as they do with Team Fortress 2. Unfortunately, this is impossible on the PlayStation 3 (or any other current gen console) due to the lengthy approval process required for every patch.
"The beta has proved we want to update not just the beta, but the game itself post-launch frequently on the PC," Valve's Chet Faliszek explained. "To do that we need to separate the platforms so one doesn't hamstring the other. So for that, we have removed the idea of cross-platform play -- essentially make all platforms stronger by not mixing them."