I can tell you now the AI are complete bastards.
They are very smart, they follow all commands issued by the player, they now face the nearest visible enemy, so not the nearest if they are over a hill and cant be seen, brings a new tactical advantage into the game. They follow all commands, such as fire on my command, (left, mid and right). They crouch automatically when in rank file, and in melee, well they swarm you and if you get to kill you your exceptionally lucky.