No, we all knew he was going to base the movie off of The Dark Knight Returns. But I think the entire idea of mixing The Dark Knight Storyline+Justice League No.1 New 52 Storyline is rushing the narrative way too much. Let's just think about this here, we are mixing a Mark Millar story with brand New 52 story. There are going to be some serious clashes stylistically. Like, where are they going to tone down the Millar story to fit in with the 52 universe story?
There are a lot of moving parts in this movie. 10-20 potential heroes/villains in the movie and tons of history. I'm thinking half the movie could be flashbacks (Mainly dealing with the universe before Superman was revealed to the world) while the other half being the battle between Superman and Batman. 3 hours min movie..