Suicide Squad: Kill the Justice League will let players fight as the Arkhamverse's version of Task Force X. With four-player co-op, the game could be an interesting twist in the Arkham formula, which has been exclusively single-player so far.
The revived mainstream interest in Suicide Squad as an IP began with the release of the trailer for the 2016 Suicide Squad movie. However, there are some big differences between the movie version and the Squad players can expect to see in Suicide Squad: Kill the Justice League.
The Squad
In the Suicide Squad movie Task Force X contains Harley Quinn, Deadshot, Captain Boomerang, El Diablo, Killer Croc, and, for a brief time, Slipknot. The four player characters of Kill the Justice League will include the Arkhamverse's versions of Harley Quinn, Deadshot, and Captain Boomerang.
King Shark, however, takes the role of Task Force X's muscle-bound beast-man from Killer Croc. This is odd considering King Shark's death in Assault on Arkham, which suggests that Kill the Justice League either takes place in a slightly different or retconned continuity from past entries in the Arkham franchise. It is likely, however, that the voice giving Harley commands in the game's trailer is still Amanda Waller, who is in charge of the Squad across both the Arkhamverse and the movie.
Batman Is Retired
While Ben Affleck's Batman appears at the start of the Suicide Squad movie, it seems unlikely that Bruce Wayne will be showing up in the upcoming game despite its "Kill the Justice League" subtitle. At the end of Arkham Knight, Batman initiated the Knightfall Protocol. This heavily implied that he had faked his death and given up his life as the Caped Crusader after his identity was revealed. Though Arkham Knight's secret ending hinted that some version of the Dark Knight was still roaming Gotham's streets, it seems unlikely that Rocksteady will go back on the ending of the last Arkham game in a spin-off like Suicide Squad: Kill the Justice League.
The Joker Is Dead
The Joker and his relationship with Harley Quinn was one of the main subplots of Suicide Squad, even if Jared Leto's Joker was not as popular as past incarnations of the character among some fans. Harley starts off the movie in a relationship with the Joker, and at the end he rescues her from prison.
The Joker is unlikely to appear in Suicide Squad: Kill the Justice League, though admittedly his death in Arkham City hasn't stopped the Clown Prince of Crime returning before. Arkham Knight saw the Joker lodged in Batman's psyche as a series of visions, and it is possible that Harley will be reminded of the Joker at different points in the new game's plot. The Joker's death could also see the game's version of Harley finally get over him, taking a cue from the Birds of Prey movie and exploring her transformation from villainous sidekick to anti-hero.
Superman's Gone Rogue
Suicide Squad takes place in the DCEU, after Superman's death at the end of Batman v Superman: Dawn of Justice and before his resurrection in Justice League. While the Snyder Cut certainly played with the idea of Superman turning evil, Suicide Squad: Kill the Justice League appears to be running with that as a premise. In the trailer, the Man of Steel shows up only to kill a helicopter pilot he appeared to have saved before turning his sights on the Squad itself.
Brainiac Has Invaded
Based on the Suicide Squad: Kill the Justice League trailer, DC supervillain Brainiac has invaded Metropolis. His distinct skull-shaped ship looms over the city, and he may be part of the reason Superman has become an antagonist. How his role will be expanded upon - and who the ultimate villain of Kill the Justice League will be - remains to be seen.
Suicide Squad: Kill the Justice League releases in 2022 for PC, PS5, and Xbox Series X/S.