If they announced Ray Palmer, I would believe it. I would assume that he would take the Atom mantle, which would make sense since both Hawkman and Green Arrow are on the team. But still, the confirmed people so far are Adam Strange, the First Nations girl, Hawkman, Green Arrow, and Animal Man.
I would be super happy if Atom made the cut. I would be far happier if Black Canary was announced, too.
And that's not all. One more member of the Justice League of America has been confirmed. But I'm not too sure who it's going to be. For the record, the candidates are J'onn (most likely), Selina, Tatsu, Simon, Cisco, and Courtney. If only Jeff Lemire could give us a hint.
Well, he did say "someone from Agents of SHADE" so that's useful material to know.
I actually suspect that it'll be Simon Baz... I feel like Courtney will almost certainly just go wherever Johns goes next, Selina's too tied up by the Bat-office, and J'onn feels like he's on his way to Justice League to me. Katana will almost certainly get to head back to Birds of Prey.