There's one thing I believe with certainty: Warner Bros has no idea how to approach the Justice League movie.
I've now heard from multiple sources that the Will Beall script for Justice League has been scrapped. The story from each source is the same: it's terrible. Some sources seem to think the whole movie is going to fall apart and never happen, while some believe that Warner Bros will keep moving forward, unwilling to lose the superhero arms race.
Beall's script supposedly includes Darkseid and a heavy cosmic threat. But the script has been half-baked from the beginning, with reports saying that heroes (beyond the core five of Batman, Superman, Wonder Woman, The Flash and Green Lantern) have been cut and added from the proceedings seemingly at studio executive will. The latest word was that Warner Bros, experiencing real cold feet, had decided to wait until The Man of Steel to really move forward, but it's possible that moving forward now will mean a whole new script.
Meanwhile the studio has been unable to get the interest of a quality director, reportedly because of the script. Without a script and without a director, Justice League seems unlikely to meet a 2015 release. The question is will it ever be released at all?