The website Thinkmcflythink.com (gotta love that name!) is reporting that Warner Bros., which had made note that a Justice League movie was on the table, is developing a Superman/Batman film. States the story, "The studio is also quietly developing a Batman/Superman team-up movie. Similar to Justice League, the Brothers Warner has wanted to get their two biggest superheroes on the same screen together for years. The closest it came to fruition was Batman vs. Superman with Wolfgang Peterson-directing from a script by Andrew Kevin Walker. That fell apart as we all know, but executives loved that script. In a classic case of covering your ass, what we're hearing is two separate incarnations are being tooled. One version where the World's Greatest Detective is firmly established and helps mentor an up-and-coming, fresh-faced Supes and vice versa. Essentially, they're hoping they can woo Christian Bale back into the cape-and-cowl for a fourth time and in case the Oscar-winner tells them, 'No thanks, I'm done!', they'll go for a new actor altogether. Both versions would feature Henry Cavill's Last Son of Krypton."
Editorial Note: While an intriguing notion, any possibility of a Superman/Batman movie would be years away. At least it would seem so, given that Christopher Nolan's The Dark Knight Rises hits theatres summer 2012 and Zack Snyder's Man of Steel the following summer. Still, this would be such a preferable idea to the notion of a Justice League movie; it would just be that much more realistic... if that's not too weird a word given the context.