The entire film was leaked on Twitter this past weekend
https://comicbookmovie.com/the-flash/the-flash-the-entirety-of-the-movie-leaked-on-twitter-over-the-weekend-a204023
Miller is doing no press, he will make a low-profile appearance at the world premiere for photo-ops only, no interviews.
https://variety.com/2023/film/news/the-flash-release-ezra-miller-premiere-secret-ending-sequel-1235632040/
Andy Muschietti says they will not recast Ezra Miller if there's a sequel.
https://theplaylist.net/the-flash-director-andy-muschietti-says-no-one-else-can-replace-ezra-miller-if-theres-a-sequel-20230530/?utm_source=dlvr.it&utm_medium=twitter