Warner Bros. is about to bring together two of its most iconic heroes: Superman and Batman will unite in a new film, the follow-up to “Man of Steel,” set for release in 2015.
According to two sources with knowledge of the movie, Warner Bros. intends to announce the news at its Comic-Con International panel Saturday morning. Said a Warner Bros. spokesperson, “We don’t comment on rumors regarding these properties.”
“Man of Steel” director Zack Snyder is expected to reunite with screenwriter David S. Goyer and star Henry Cavill for the new film. It’s unlikely Christian Bale will step back into the bat suit, as the actor has indicated publicly that he has moved on from his days as Bruce Wayne.
http://herocomplex.latimes.com/movies/comic-con-2013-superman-batman-movie-will-follow-man-of-steel/
Let's assume this is true and does happen - how do you do such a film?