Batman fans will be thrilled to know they can enjoy Gotham City even more, as Gotham Knights will receive standalone DLC in the form of Heroic Assault. This will be a 4-player co-op mode separate from the main story and free-to-play.
The official Gotham Knights Twitter states, "Gotham has thrown down a new gauntlet. Heroic Assault, the free 4-player co-op experience, is coming," and it will release on November 29, 2022. We don't have many details on the post-launch expansion, but it will expand Gotham Knight's multiplayer from the co-op in the story to a 4-player arena experience.
Gotham Knight's Heroic Assault will be a co-op arena mode in which players work together across 30 floors. Different environments and objectives will offer versatility to the gameplay and keep things fresh.
Heroic Assault is labeled as a standalone, but whether you need to own Gotham Knights is unclear, as the wording on the Gotham Knights' FAQ page is confusing. It is listed as a standalone mode and a free update for all Gotham Knight owners. We will likely receive more information closer to its launch date.
For more information on Gotham Knights, check out Is the CW Gotham Knights TV show related to the video game? and Can you interact with civilians in Gotham Knights? on Pro Game Guides.