Momoa is signed on to star in three DC films so far, with next year's tete-a-tete coming ahead of The Justice League Part One in 2017 (which Snyder is also attached to direct), and a standalone Aquaman film in 2018. He'll probably be in the second Justice League film too, but that doesn't appear to be confirmed as yet.
I guess the big question this image poses is...who will play the seventh member of the Justice League's core team? With Ben Affleck as Batman, Henry Cavill as Superman, Gal Gadot as Wonder Woman, Ray Fisher as Cyborg, Ezra Miller as The Flash and Momoa...who gets to play Green Lantern?
Either way, we will - hopefully - find out on, if not before, 25 March 2016, when Batman v Superman: Dawn of Justice is finally unveiled.