Well Snyder has tried to downplay the Dark Knight Returns comparison recently, and suggested it's only loosely inspired by that comic. And (silly though it is) he's also said these chose the "v" instead of "vs" to downplay the antagonistic nature of the story as well. I'm sure Batman and Superman will still be at odds philosophically through much of the movie, of course. But they're not going to be duking it out onscreen for two hours. And I don't really see Superman being portrayed as much of a "villain" in the movie either (unless of course he gets infected by kryptonite and goes bad or something ). He'll obviously have the destruction of Metropolis hanging over him, and people blaming him here and there for that, but I think that's probably as far as it'll go.