This is a multiplayer focused game, so no he won't
The problem is simple: Everyone would be playing as Batman. 80% of the players, if not more, would be playing as Batman.
That's why they "killed" him, otherwise you would be seeing a group of 4 Batmans ingame
I expect to find him during the storyline, but I doubt that he is going to be a playable character. He is going to be a NPC.