Batman: Arkham Knight contains several Superman Easter Eggs. Let's speculate wildly.
In the video below, Arekkz talks us through the three Superman references found in Batman: Arkham Knight so far. Take a look:
Although Rocksteady loves to put Easter Eggs in the Arkham games, these ones seem kind of persistent to just be little nods. And as Arekkz points out, Arkham Knight is supposed to be Rocksteady's last Batman game. Hmm. We can but hope, right?