DC Studios co-CEO James Gunn has stated that the upcoming untitled Arkham series will be part of the main DCU (DC Universe) timeline. Originally intended to be a Gotham City Police Department-focused prequel to "The Batman," it has now evolved into a series set in Arkham with connections to the film's characters and their origins. Although "The Batman - Part 2" and "The Penguin" spin-off will exist within DC Elseworlds, a separate continuity, Gunn has clarified that the Arkham project was always envisioned to be a DCU series under his and co-CEO Peter Safran's leadership. This re-assignment aligns with Gunn's previous comments on respecting director Matt Reeves' decision to keep "The Batman" universe outside the DCU.

Will the untitled Arkham series be connected to the current DCU?

Yes, James Gunn confirmed that the untitled Arkham series will be part of the main DC Universe continuity.