Justice League begins filming this April. When that wraps, Jason Momoa and Ezra Miller will begin prepping for their Aquaman (to be directed by James Wan) and The Flash (to be directed by Seth Grahame-Smith) solo films, respectively. Will those be origin stories? Nope.
Wall Street Journal was told by film producer Charles Roven that The Flash and Aquaman films will be continuation stories from where their characters left off in Justice League. “While each movie stands alone, they’re all part of one long arc of storytelling,” said Roven.
As for Justice League, screenwriter Chris Terrio, who also penned Batman V. Superman: Dawn of Justice, put a lot of time and effort into learning the science and mythology of several team members. "He studied red- and blueshifts in electromagnetic physics to think about the Flash," WSJ reports, "investigated deep sea biology in the Mariana trench to create the world of Aquaman, and read the Greek historian Diodorus of Sicily’s account of the war between Amazon and Atlantis to better understand Wonder Woman."
“If you told me the most rigorous dramaturgical and intellectual product of my life would be superhero movies, I would have said you were crazy,” Terrio said.
Justice League will open in theaters November of 2017. The Flash will arrive in theaters on March 23, 2018, and Aquaman is scheduled to hit theaters July 27, 2018.