From the concept art shelled out, it looks as if it will be. (mainly the dam looking one)And the fact that if microsoft hadnt interveened, Halo would have been open world, makes me think it will happen. I usually walk passed mmos, except for Firefall. I hope it is a new variant of mmo that feels like fallout 3 or borderlands, but has so much space that you dont run across other players every 30 seconds. Game devs should take traits from DayZ. (The backpack, survival, large world, and multiple servers. I hope its good...