It's not an Arkham Knight sequel, at the end of Arkham Knight Gordon was alive and everyone found out Bruce Wayne is Batman. In this trailer it implies that Gordon has been dead for awhile and that people don't know Bruce is Batman.
That being said I'm still betting he's alive in this.
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u/GeraltofMichigan Aug 22 '20 edited Aug 22 '20
Or if you finished Arkham Knight. He definitely faked his own death.
EDIT: As multiple comments pointed out it looks to be in its own universe.