My speculation is that this film will be about Superman but he won't be the focus. It probably doesn't make sense but it's the only way I can say it. I believe the first half of the film will deal with the aftermath of the final battle between him and Zod. There will be arguments saying how dangerous he is and all that, and Lex will basically be the J Jonah Jameson type. I suspect Bruce will team up with Lex in rebuilding the city or have already had the discussions of rebuilding the city. I believe whatever villain will star in the movie, will be the reason why Batman and Superman meet. I only say meet because I can't see them fighting.