DC Studios and Warner Bros. have released the first official trailer for The Flash, featuring the return of Michael Keaton's Batman which may cause confusion over the status of Robert Pattinson as the Dark Knight. As seen in 2022's The Batman from director Matt Reeves, Pattinson stars as a younger Bruce Wayne who's already begun to build his legend in Gotham City. However, The Flash will see Keaton returning as the Dark Knight after 31 years, his last appearance being 1992's Batman Returns from director Tim Burton.
https://screenrant.com/what-the-flash-movie-means-for-robert-pattinson-batman/