Now, comic book scribe Mark Millar has come out on his forums and stated the Justice League Movie script is both dark and mature — much to his surprise.
A pal of mine is good friends with the new Justice League screenwriter and said his take on the team is incredible. Very real-world and not at all what you might expect. WB has a chequered history with their superhero characters. They're great with their boy wizards, but less consistent with their DC stable. But my chum said that this could be a thing of beauty and has been in the works for a little while now, not just an avengers knock-off. Best of luck to them. The tidbits I heard sound quite dark and mature, which isn't what I expected. But word on Gangster Squad is great too so I feel this is in really good hands.
Millar also went on to thank his fans for the recent sell out of his comic book, Super Crooks #3.