With Ben Affleck releasing the Justice League video, it's wondered where is the footage from?
Obviously as Zack Snyder is filming Justice League, it seems likely Deathstroke will be appearing in the film.
Further evidence of Deathstroke in Justice League may actually come from that one set image a while back that Zack Snyder released of the Justice League costumes (see below) which seemingly features Deathstroke's armor and costume.
The footage may also feature Deathstroke in the Justice League Flying Fox hellicarrier which set visits revealed was retrofitted from an old Wayne Technologies project. The Justice League Flying Fox hellicarrier is a plane that has three levels, with the bottom housing the Batmobile, seats on the walls, and a ramp that lowers. The second level has a cockpit with a gun (Justice League movie concept art featuring Alfred as the gunnery) and an armory of weapons. The third level also has the main cockpit where two pilots can sit.
"It’s big enough for the Batmobile and it can house other of the Bat gadgets. It’s definitely its own self contained, fantastic piece of equipment," producer Charles Roven said about the Justice League Flying Fox hellicarrier in a previous interview.
Regarding why Deathstroke might be on the Flying Fox is unknown, but fans are already theorizing that perhaps Steppenwolf creates an army of Metahumans. Is Deathstroke their leader?
"Justice League" has a November 17, 2017 release directed by Zack Snyder starring Ben Affleck as Batman, Henry Cavill as Superman, Gal Gadot as Wonder Woman, Jason Momoa as Aquaman, Ezra Miller as The Flash, Ray Fisher as Cyborg, J.K. Simmons as Commissioner Gordon and Willem Dafoe as an Atlantean.
Ben Affleck Teases Deathstroke