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Now take this with a huge grain of salt, but the people over at Cosmic Book News seem to have some information regarding Warner Brothers plans to do a Justice League movie. According to their information the Justice League movie would happen after sequels for Zack Snyder's Man Of Steel and Martian Campbell's Green Lantern. WB is wanting Christopher Nolan to be involved with the project some how, with Geoff Johns to write a treatment for the film. After Johns does his treatment the hope is that they can bring in David Goyer to pen the final screen play. The plan is for Henry Cavill and Ryan Reynolds to reprise their roles of Superman and Green Lantern respectively. As of right now there is now plan for Christen Bale to reprise his role as Bruce Wayne/Batman for the film as well.
Here is the full report from Cosmic Book News:
Plans are being put together for Justice League movie for either a 2015 or 2016 release.NOW WEATHER THIS FILM WILL BE GOING HEAD I DONT KNOW,THERE ARE RUMOUR AT THE MOMENT THAT A STORY IS BEING WRITEN FOR THE FILM BUT THESE ARE JUST RUMOURS AT THE MOMENT, ATTENDED REALISE IS SAID TO BE AROUND MAY BE 2014 OR 2015 ,SO WE WILL HAVE TO KEEP AN EYE OUT FOR ANY NEWS THAT THIS FILM MITE BE GIVEN THE GO AHEAD.
DC Entertainment will be spearheading the film, and it will be distributed by Warner Bros. and Legendary Pictures.
Geoff Johns, DC Comics Chief Creative Officer and Co-Producer on the Green Lantern movie, will be on the Justice League movie as an Executive Producer, and will be doing the initial treatment for the film before a writer is brought on to pen the screenplay.
David Goyer (screenwriter on Man of Steel) is said to be the initial favorite for the screenplay.
As Johns hasn't started work on the treatment yet, story details will not be made known, just production details within the next few months as to what it will hold.
The reason for the later release date is to get the movie right and do it proper.
They want Christopher Nolan and wife, Emma Thomas, to be involved in the film in some capacity, most likely as producers. Don't expect Christian Bale as Batman; it will be a new actor in the role.
However, Henry Cavill and Ryan Reynolds could appear as their respective characters, Superman and Green Lantern -- but it is too early to tell.
There is a strong indication that the Justice League movie will be part of a shared universe.
WB wants another Superman movie released before Justice League; however, don't expect that story to be compromised for Justice League, as the next Superman film will still be treated as a stand alone film.
Another Green Lantern film before Justice League is also a possibility. It's being said the Green Lantern sequel will definitely be better than the first as Sinestro will be the villain, and also that the sequel will act as the first step towards a joint universe in which hints towards other heroes can be intergrated more easily (than lets say a Superman sequel).