Why does everyone keep saying Wonderwoman when the article clearly states that the character is going to be male? I mean, yes I know she's an Amazon, but they are all female, despite having predominantly male traits. (At least I think they're all female, I've never read any of her comics.)
Anyways I hope it's Batman, because that would be an interesting twist, but I can't see any way for them to put that into a story arc without it being extremely forced. My first reaction was "AQUAMAN" but as people have already said, he is married. So I'm going to have to go with Flash or Green Lantern. Because Superman and Louis Lane have been a pair for so long that the only reason for Superman to be gay is that the publishers are trolling the fans. (When I say pair I don't mean they have been together the entire time, only that to my knowledge the only people Superman has been canonically paired with are Louis and Wonderwoman.)