Back in July,
Batman-on-Film reported that Ben Affleck's solo Batman movie will take place inside Arkham Asylum, in a film that sounds very similar to the Arkham series of video games from Rocksteady. Yesterday, Heroic Hollywood founder and The Wrap film reporter Umberto "El Mayimbe" Gonzalez backed that rumor but clarified that the entire will won't be set in Gotham's home for the criminally insane.
How Deathstroke factors into the film is anyone's guess at this point. Evidence has been gathered supporting the notion that the skilled mercenary appears in Justice League before tangling with The Dark Knight, one-on-one in Ben Affleck's solo superhero feature. Affleck has previously stated that his film will borrow from a few notable comic book runs but for the most part, will be an original story.