Re: Supes and Bats: how do they discover each other's identity (or do they?)
I think this is one of the inherent problems you face when you strive for realism. Superman would alter the course of history. He'd have the most recognizable face on earth. Clark Kent wouldn't be able to fool any person alive. I'm not saying trash the concept, in fact I love the concept. But this is one of the problems you face when you try and remove the magic from Superman by choosing a more grounded tone.
Batman is supposedly the world's greatest detective. The moment he lays eyes on Clark Kent he would know who he is, and yet I'm sure the movie will have to involve some caper where Batman has to "solve" the mystery. Kinda silly, no?