Now his casting is finally official...It’s been one of the least-well-kept secrets around in recent months, but now that Warner Bros. has officially confirmed that Jason Momoa is set to play Aquaman, the actor himself is finally able to talk about the role. And he did just that this weekend at Atlanta’s Walker Stalker convention event, according to Comibook.com.Momoa is happy that the catfish is out of the bag, because, if we’re all honest, he wasn’t always subtle about hinting at the casting decision.