According to Warner Bros’. official press release, production on their Batman-Superman film will start next year. The story is by Zack Snyder and David S. Goyer, with Goyer soon moving on to write the script.
Of course, other writers may come on board in due course, but this is the status quo right now, according to Warner Bros. Why they didn’t tell us this in Hall H, I don’t know. Maybe to make the press feel more important than 6,500 fans?