As recently as last March, Warner Brothers head-kahuna Jeff Robinov told Hero Complex they were getting the ball rolling on Justice League for 2013 and a post-Christopher Nolan Batman movie of some kind with Nolan and his wife Emma Thomas playing a hand as producers, a la their participation on The Man of Steel. Since Zack Snyder's Superman reboot got pushed back from Christmas 2012 to Summer 2013, don't count on seeing Justice League two years from now and no telling how soon we'd see the first Bats flick following Nolan's swan-song The Dark Knight Rises.
Sources tell TMT WB is keen on getting a Justice League movie going and still high on The Flash despite Green Lantern being neither the critical or commercial success they'd hoped for nor was it embraced by fans. But 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.
Are these plans definite? No, as we mentioned earlier WB, by their own admission, is back into the Justice League mind-set in addition to The Flash, another iteration of Batman, a hypothetical The Man of Steel sequel (Of course, that depends on how the first movie does plus any outcome to the Shuster/Siegel court-cases), etc.
A lot of this is due to their non-definitive plans after 2013. Unlike Marvel who has their shit in order so much so they just announced two "mystery" movies for Summer 2014. So God only knows what we'll end up seeing from them after The Man of Steel.