This is from collider.com
Director Andy Muschietti teased a potentially brutal destiny for Michael Keaton's Batman in the upcoming Flash movie. The photo shows the unmistakable Batman uniform Keaton used in Batman Returns, with a
suspicious bloodstain over the Bat symbol.
Keaton confirmed last April he would be back as Batman in the upcoming movie, which promises to shatter space-time when the Flash goes back in time to save his mother. Inspired by the Flashpoint comic book
storyline, The Flash is a central movie for the future of DC in theaters, as the new shared universe Warner Bros. intends to builds will use its storyline to clear the slate and move beyond the Zack Snyder
era of DC movies.
Even though production of The Flash started in April with the reveal of a new logo, we still don't know much about the movie. Muschietti is keeping the lid closely tight on this project, which is probably
the best approach, as early spoilers could ruin the multidimensional surprises the film is bound to have.