So, ArmA III has been announced!!! See this link for more details http://www.arma3.com/buy
I cannot see getting anything but the supporter edition since, in my mind it is the best value. You get a 60 dollar set of games, 30-45 dollars worth of DLC, and you get to help out the developers. Considering DMC put some time into the game, and I personally love ArmA and find that BIS are the only real PC developers left, that produce content of value anymore it is a no-brainer.
Here's some pictures, also if you buy the game you get 3 invites for the singleplayer alpha.
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Night time is looking very cool, as well as underwater combat - imagine being a frogman in DayZ, coming out of the water in Cherno blasting beaners away in the night.
Any who, the mod support and already existent mod community makes the game worth much much more than BF3. Also imagine PR in A3!