Honchos at Superman's comic book home, DC Comics, said this weekend that one of their most identifiable (but as of yet unnamed) straight characters will soon be coming out of the closet, according to a report.
"Most identifiable" means probably not a minor character, so maybe it's Wonder Woman, or Robin. They also don't say "superhero" so maybe it is a villian. Lex Luthor?

Okay, I'm going back to my writing, this is too much silly guessing.