A brand new Batman: Arkham Knight trailer has just launched under the name "All Who Follow You." This trailer reveals a new gameplay mechanic and confirms the return of four characters from Arkham City: Nightwing, Robin (3), Catwoman, and Azrael. Nightwing, Robin, and Catwoman have all been confirmed to be playable with the new gameplay mechanic. 

This new gameplay mechanic for Arkham Knight is called "Dual Play." Dual Play will allow the player to seamlessly switch between Batman, Catwoman, Robin, and Nightwing in free-flow combat. It has not yet been confirmed if this feature will be usable anytime other than specific moments in the game. 

With his back against the wall, Batman turns to his closest allies to help him save Gotham City from the clutches of Scarecrow and the Arkham Knight’s army. A familiar face also returns to give The Dark Knight a message he cannot ignore

                                            

Batman: Arkham Knight will be released on June 23, 2015 for PS4, Xbox One, and PC.