Warner Bros. Motion Pictures president Toby Emmerich has a vision for the future of DC Films in which projects are less specifically connected and directors have more freedom to explore their unique visions.
“We don’t want to limit the creativity filmmakers can bring to the table by saying these characters have to come in a particular order and all fit into the same universe,” Emmerich told the Wall Street Journal.
Additionally, with only Aquaman scheduled for theatrical release in the year following Justice League, Warner Bros. views 2018 as a "reset year," according to an anonymous source quoted in the WSJ's report. Coupled with news that Flashpoint, based on the comic book event that led to the "New 52" reboot is close to landing a director, the idea that WB could be completely reconfiguring their universe carries some implications as to exactly what "reset" could mean.
After 2018, Warner Bros. has multiple superhero films in development including Joss Whedon's Batgirl, Shazam!, Suicide Squad 2, The Batman, Green Lantern Corps, and more - some of which may be connected to a larger continuity and others of which may stand alone.
Justice League is due out in theaters November 17.