Phil Lord and Chris Miller were originally set to write The Flash, but when Han Solo came calling, the filmmaking duo departed the project after penning a treatment for Warner Bros. It was then down to Seth Grahame-Smith to take over, but when he parted ways with the studio over creative differences stemming from the writer's plan to also direct, Rick Famuyiwa ended up rewriting it to his tastes.
He too wound up leaving The Flash for the same reason, and while it's been obvious for a while now that the movie probably wouldn't meet its July 2018 release date, that now looks almost impossible. That's because the studio has decided to take things in a totally different direction, mostly because Famuyiwa's departure was related to executives disagreeing with where he'd taken the story.
As a result, Joby Harold (King Arthur: Legend of the Sword, Robin Hood) has been tapped to do a total rewrite. Warner Bros. is in no rush to find a new director, especially as Ezra Miller has Fantastic Beasts and Where to Find Them 2 on the horizon. It's possible that The Flash could still reach the big screen in 2018, but everything from Cyborg's role to the rumoured villains should probably be discounted now!