EA and Dice revealed Battlefield 4's multiplayer gameplay at E3 and the also revealed the new Commander Mode.
The Commander has a tactical advantage by seeing an overview of the map and can help out the team by letting them know where enemies are, calling in air strikes, dropping vehicles and supplies and more. The Commander can use a tablet connected to live games to turn the tide of the battle.
I loved Battlefield 3 and Battlefield 4 is looking amazing. I am really interested to see how Commander mode works out. I am hoping that winning battles doesn't depend on whether or not you have a competent Commander. Also It would seem unfair to me if one team has a Commander and the other doesn't.