It's being reported the Ezra Miller The Flash movie has been moved up a week by Warner Bros. from from March 23, 2018 to March 16, 2018.
WB has yet to officially announce a release date for The Flash film, but the March 2018 release date has been heavily speculated for a while. Below you can check out the recent Dawn of the Justice League Flash featurette. Ezra Miller will also first appear in Batman Vs. Superman.
It's also reported WB has given an "event film" a March 2, 2018 release date, and also a New Line tentpole release (Dwayne Johnson San Andreas sequel? Shazam?) on April 20, 2018.
In addition, Steven Spielberg's Ready Player One has changed its release date as a result of the new December 2017 Star Wars: Episode VIII release date. Ready Player One will now get released on March 30, 2018.
Dawn of the Justice League Flash Featurette: