This trailer shows that the main antagonist will most likely be the Black Mask. In the trailer Black Mask hired Deathstroke to kill Batman. While the two are fighting a marksman that could possible be deadshot interveines by shooting Deathstrokes sword apart and shooting the chain holding the shipping container. Also some fun facts about this is the case the thugs were holding in the beginning of the trailer had the label Queen Industries which is ran by Oliver Queen or you guys might know him as the Green Arrow. Also the bullet casing that Batman was looking at said Amertek which is fictional military industrial firm. The firm is also associated with the Superhero Steel, but what can we expect from all of these little things hopefully all these little hints they show actually make it to the game.