I would hope that Lois knows what happened to him.
And if she knows, then it would be likely that Batman knows. I guess anyone else knowing would depend on whether he ever shared his identity with the Justice League, but it sounds like they're as in the dark as everyone else. Part of me is thinking that he just retired, especially given the title, but I would expect Clark to actually state that he was leaving if that was the case.
All in all, a very intriguing story, and I look forward to the rest of it.
