Ben Affleck is coming back to do reshoots for The Flash. Zaslav want Affleck's Batman to be major character in the movie.
Currently Affleck's Batman is present on in the beginning and in a post-credits scene. This change might make him the face of the movie alongside Michael Keaton.
Pay attention to when he'll shave his beard, that's when he'll be filming the new scenes. The person breaking this "scoop" is the same one that broke the fact Ben Affleck was filming new scenes for Aquaman and the Lost Kingdom.
From what was said David Zaslav wants to shift the focus away from Ezra Miller given the public opinion. When he learned that the movie had two different Batman and they don't meet one another at any point in the movie he called it stupid and said the movie needed to be reworked to be less about the Flash and more about the historical meeting of the two Batmen.
There are serious discussions about changing the title of the movie. It might end up being something generic like Flashpoint or something. More of an event film than a solo character film.