Next Man of Steel will be Batman vs. Superman!



Snyder first confirmed that he is working on another Superman film, then brought out actor Harry Lennix, who played General Swanwick in Man of Steel, to read something:

"I want you to remember, Clark…in all the years to come…in your most private moments…I want you to remember…my hand…at your throat…I want…you to remember…the one man who beat you."

Oh yeah, that's a quote from Frank Miller's seminal comic The Dark Knight Returns, which pitted an aging Batman against a Superman who had turned government agent. Snyder noted that his film will not be a Dark Knight Returns adaptation, but will draw inspiration from it. All this hints that we're not just getting a Batman/Superman teamup. We're getting Batman vs. Superman!
More info here