Keaton's gonna be in it too. Multi world/Flash ... it's his thing to run into all these Batmans all the time. Heh.
Hm. So if it’s following Flashpoint comic, I’m assuming Affleck reprises his Batman role in the prologue or first act, Barry causes Flashpoint universe, and instead of Affleck you get Keaton Batman in the alternate timeline. but I suspect Keaton is going to be playing more like Old Man Bruce from Batman Beyond instead of gunslinging Thomas Wayne Batman from the comic.
According to The Wrap: “Also of note, there will be no other films with Affleck’s Batman or an HBO MAX show as has been rumored online amongst fanboy outlets.“
Might be behind the scenes footage/some short snippets of the movie like what was shown at The Suicide Squad’s panel. According to Matt Reeves we are 100% seeing *something*, though.