Gotham Knights might let you play with up to four players online, despite so far being advertised as allowing two-player co-op.
So far, in all the marketing for the game, only two-player co-op has been advertised, making this a bit of a big change for online gameplay.
Gotham Knights was originally meant to launch last year, after being announced in 2020, but saw a vague delay into 2022.
At the moment Gotham Knights is only meant to let you play with one other friend online, but the PSN store page for the game has recently been updated to say that it “supports up to 4 online players with PS Plus” (via Reddit).