I got my first chance to play the Battlefield 2 Demo (download) last night after work. I noticed several big changes from Battlefield Vietnam and Battlefield, as well as the Desert Combat mod. Graphically they’ve added some bloom to the video to make everything have a slight haze, which adds to the realism of the game by making everything hazy as if you were outside in too much sunlight. Your field of vision is also affected by a concussion effect when you get hit by grenades or tank rounds. I spent about 30 minutes just using the anti-air weapons to kill planes. There is a neat radar lock where if a vehicle approaches you can lock onto its heat signature and launch heat-seeking anti-air missiles at it. The target can throw off some flares to prevent getting hit. It is very cool.