Justice League "The Mythical Snyder Cut".

Justice League 2017

Warner Bros. still hasn't announced that the Snyder Cut of the Justice League will release or not. Justice League was a total disaster at the box office, it's been nearly a year it hit theaters, now D.C. fans are demanding for a Snyder Cut of the Film, which actually doesn't exist.

Snyder version of Justice League

The Zack Snyder version of the Justice League was very alike BvS 2016 dark and brutal. It was announced in May 2017 that Zack Snyder was stepping down as the director of Justice League film due to his family tragedy. Although it was rumoured that he still wanted to keep working on the film but removed due to creative differences.

Zack Snyder instructing Ben & Gal

Then Joss Whedon came in the director of "The Avengers" & "Avengers: Age of Ultron". He worked atleast third of the movie. He rewrite some scenes which was when Barry Allen falls on the breast of Wonder Woman just like Mark Buffalo falls on Scarlett Johannson in Age of Ultron. He removed some shots, moment and line of dialogues from the film before the final cut.

Reshoot scene by Joss Whedon

The Superman's return to the film seems to be part of the reshoots by Joss Whedon due to Henry Cavill's CGI cartoon face. Cavill could not shave for the reshoots, because Paramount was holding the contractual right of mustache ownership.

Superman CGI face a part of the reshoot

Overall the final cut of Justice League is clearly of Whedon's not Snyder's, despite studio claims that the Whedon's influence was minimal.
As according to the D.C. fans Snyder Cut was far better than the released cut of the film.
According to reports Zack Snyder's didn't entirely shooted the Justice League, some of the scenes that he shooted was removed from the film which we saw in the trailer.
So there is a very less possibility that the Snyder cut of the Justice League will hit theater.