Following on from the new video we have a couple new BiA articles to check out.

Brothers in Arms Multiplayer Hands-On at IGN

The guys at Gearbox readily say that they are going for tactics over deathmatch in the implementation of the multiplayer of Brothers in Arms. What does this mean for the game? Well, first off, as stated earlier, each player will be in charge of him or herself as well as a fire or assault team. These guys can receive simple commands such as rally around, fire on this target, or move and cover here. At this point, the AI seems pretty darn reactive and will defend and attack as needed. They won't ever advance without your orders, but are handy to have along in a heavy firefight. If a player character is killed in combat, he or she can then jump in to take over for one of the surviving members of the group.

Brothers in Arms Preview at GameSpot

Other multiplayer missions will present different challenges. One, called Darkness, will have the American players parachuting solo into German-held Normandy. In other words, the Americans won't have any AI-troops to control. Meanwhile, the Germans will have their standard fireteams. Under cover of night, the Americans, each armed with a sniper rifle, must work together to locate explosives to blow up a bridge. Meanwhile, the Germans must try to stop them. It'll be important for the Americans to cooperate, so one sniper must fix the enemy in position while the other flanks him.