I’m as confused as you are. Gotham City Impostors is the Batman game that doesn’t feature Batman. Arkham Asylum was the Batman game that features a lot of Batman. Now, those two worlds collide, kind of – it’s not really the same Arkham Asylum map as Rocksteady’s grim portrayal. And there’s still no Batman.
God, my mind aches. Here’s a trailer for the free Arkham Asylum map coming to Gotham City Impostors.