He is already confirmed for the solo debut in 2018 and rumored for Batman V Superman. Despite fans’ disappointment with DC’s choice of not picking Grant Gustin for the big screen, Ezra Miller is the one they’ll use for the cinematic universe.
And can we hope to see him in The Justice League? Well, he is kind of central to the league, on a par with Superman and Batman, so leaving him out surely makes no sense.
Of all possible additions to the cast, Ezra Miller as the Flash seems the most likely.
Common as Green Lantern

I really don’t see Ryan Reynolds returning as Green Lantern, not after the disappointing box-office performance of the movie in 2011.
