First up with Deadshot, Captain Boomerang and Harley Quinn having claimed to be pro and current members of the Suicide Squad
Next with the Penguin holding a grudge against Harley over her and her boyfriend the Joker driving his truck of cigarettes into the river just for fun
Next with Harley Quinn pulling out a Bat costume that Joker wore during a train robbery which teases that the second Arkham Origins game may revolve around Joker impersonating Batman to frame him for defying his demands on killing Bane in Arkham Origins
And to the major characters who were killed in this movie are definately not coming back in Arkham Knight
that regards the 4 rookies of the Suicide Squad and Amanda Weller
to find out, please stay tuned for the upcoming Batman Arkham Knight video game and other Arkham Games that will be developed and released afterwards