Steven Weintraub, who writes for Collider, tweeted out, "Wouldn't believe anyone that says they know the current Justice League story besides Joss Whedon and DC/WB executives. Lots of changes..."
WB also had various bloggers visit the Justice League movie set last year, with Weintraub wondering how much of what they saw will actually make it into the finished version.
i learned a lot on set. i'm curious how much of that movie is going to be the finished movie.— Steven Weintraub (@colliderfrosty) September 1, 2017
The lots of changes referred to has to do with Joss Whedon replacing Zack Snyder as director on the Justice League movie. Sndyer left Justice League over a family tragedy, with Joss Whedon coming on board to help out with reshoots. Whedon was actually already involved at the time with Justice League rewrites, so it's been said Snyder hand-picked Whedon as his replacement.
Various rumors have stated that Joss Whedon is involved in extensive reshoots and rewriting of the Justice League movie, with it insinuated the film now "belongs" to Whedon.
Joss Whedon was recently given a writers credit on Justice League, and it remains to be seen if he will get a directors credit as well.
Justice League has a November 17, 2017 release directed by Zack Snyder, with the story by Chris Terrio and Zack Snyder, the screenplay by Chris Terrio and Joss Whedon, and stars Ben Affleck as Batman, Henry Cavill as Superman, Gal Gadot as Wonder Woman, Jason Momoa as Aquaman, Ezra Miller as The Flash, Ray Fisher as Cyborg, J.K. Simmons as Commissioner Gordon and Willem Dafoe an Atlantean, Nuidis Vulko.
Fueled by his restored faith in humanity and inspired by Superman’s selfless act, Bruce Wayne enlists the help of his newfound ally, Diana Prince, to face an even greater enemy. Together, Batman and Wonder Woman work quickly to find and recruit a team of metahumans to stand against this newly awakened threat. But despite the formation of this unprecedented league of heroes—Batman, Wonder Woman, Aquaman, Cyborg and The Flash—it may already be too late to save the planet from an assault of catastrophic proportions.