Zack Snyder was interviewed by Entertainment Weekly , in which he shared the details of the rating of his version of Justice League, and also said that the film could be released in theaters:
This movie is so insane and epic and will probably have an R rating. I haven’t heard anything about it from a rating agency yet, but I’m 100% sure of it. In one of the scenes, Batman swears, Cyborg is not very happy with his life before meeting the League, and Steppenwulf simply tears people in half.
I am a huge fan and supporter of watching movies in cinema. We are already discussing the possibility of a Justice League hitting a movie at the same time as HBO Max.
Discussion of the film’s release in the cinema became possible after Warner Bros. announced the release of all of the company’s films in 2021 simultaneously in theaters and on HBO Max. Zach Snyder decided that it worked in the opposite direction, so he began negotiations.
The release date for Justice League from Zach Snyder remains unknown. It is due out in 2021 on HBO Max.