To be titled as Counter-Strike: Global Offensive http://forums.steampowered.com/forums/showthread.php?t=2053144 http://www.pcgamer.com/2011/08/12/counter-strike-global-offensive-teased-on-twitter/ http://eseanews.com/index.php?s=news&d=comments&id=9967 http://www.reddit.com/r/IAmA/comments/jgehv/iama_guy_who_spend_the_day_at_valves_headquarters/ And tons more sources to link.
I'll be more interested when the details come out. As long as they don't change too much, it should do fine.
This game will be delayed due to Valve time. http://developer.valvesoftware.com/wiki/Valve_Time but I still can't wait, hopefully a Mac version is being released and the PS3 version has Steam support like Portal 2.
Most Valve games use the Source Engine which is meant to run on most machines easily. Your MacBook Air will probably be fine running the game on low/medium settings since it has the 320m GPU, but having less than 4GB of RAM may slow it down. The less powerful Core 2 Duo processor does not help either. There are no images or videos of the game yet so I cannot exactly say how well it will run.
Interested to see where they take this. The Counterstrike beta was really a huge step forward. I just always thought they'd pull a TF2 and keep updating CS Source until there was enough reason to make a sequel. I won't get it on day 1 but I'll wait for a sale.