destructible detailed enviroment.
Your comment made me think about how much I love knocking down snow covered trees in this game. They really did an amazing job on the snow maps. The "smoke" from explosions on the ground and trees falling makes it look like snow is filling the air for a second when something falls down or gets blown up. They did this on the desert map from the first beta as well but it wasn't nearly as effective as the cloud of white that hangs around after you knock down a tree...