[Nowhere Man]

I figure they'll say a line or two from it when Batman inevitably beats Superman since A) he's the fan favorite and B) generally speaking it's more satisfying to see the clever underdog beat the super-powerful demigod. My guess, though, is that the Superman/Batman fight won't be the finale--it'll probably be the end of the second act, after which they'll team up to fight the bigger villain in the end.