Man of Steel screenwriter David S. Goyer has been talking about a sequel and the possible Justice League movie. Regarding the latter, he tells Hey U Guys that it would definitely feature a new Batman and not Christian Bale, as was rumored before.
"It would be disingenuous to say Warner Bros doesn’t hope that this would be the starting point for a shared universe. And Zack has said that Bruce Wayne exists in this universe. It would be a different Bruce Wayne from Chris’ [Nolan] Dark Knight trilogy, and it would be disingenuous to say that Zack and I haven’t had various conversations on set, around ‘what if’ and ‘moving forward’.
That having been said, it’s all going to depend on the next few weeks. Warner Bros has hopes that there will be more Man Of Steel films, and that this will be the beginning of a shared universe. We could meet Batman, or Wonder Woman, or the Justice League in these movies. But they all hinge on box office reception."
"I think Warner Bros has seen – and Chris deserves the biggest credit for this – that we were able to revitalise Batman and put it into the first billion dollar superhero film. And they’re hoping that Superman will be revistalised as well. And if we can do Batman and Superman, then maybe we can move on to Wonder Woman, and The Flash, and characters like that."
"If Lex is going to exist in the world, we would presumably have to give him the same treatment that we gave Lois Lane in the first film, which is make him a credible character. [...] He’s gotta be a man of incredible intelligence, and presumably a man of incredible wealth and incredible resources."