Heres some questions and clues more:
- The Batman on the left of the closet, we believe its Dick Grayson but the question arises why does he have a Red Robin belt? Could he actually be Jason Todd? But then comes my overanalizing that Alfred is looking suspiciously at him. :P
- Harley Quinn's glove that holds the gun is blue, could it be a joke that she will fight for the cowl too? =D
- I honestly believe the gun wielder has to be Deadshot, even the Bat symbol on his chest have gun bullets, it has to be him!