Playing Counter-Strike: Global Offensive on Steam? Valve has released two new maps, one of which includes changes to the game's Classic Competitive matchmaking system.
Vertigo returns from the original CS, and the other map is called Monastery. A full list of updates can be found here
Classic Competitive now works on a queue-based system rather than letting players join during a game's progress. If you quit a CC match you will now be penalised and locked out of the mode for half an hour.
More information can be found on the title's blog.