While at the Sundance Film Festival, Joseph Gordon-Levitt was asked about the rumor of him appearing in Man Of Steel as Batman.
"I hadn't heard that one. It just goes to show how much you can believe rumors. I don't think you should believe in any of them. If there's something I'm going to be in, I'm going to tell you about it. I put it on my Twitter that I was in Sin City 2, so TRUST me, I'll tell you."