HeyUGuys was able to ask director Zack Snyder a Justice League question during the UK premiere of Sucker Punch. They asked how his Superman would fit into DC's answer to the Avengers. Zack stated that both his take on Superman and along with Nolan's Batman won't be involved. They will have a separate take on the heroes.
"It doesn’t. Like what Chris Nolan is doing and what I’m doing with Superman, what they’ll do with Justice League will be it’s own thing with it’s own Batman and own Superman. We’ll be over here with our movie and they kinda get to do it twice which is kinda cool."
It's unknown if Ryan Reynolds' Green Lantern will be included or not. This could give a clue on purposed Batman reboot. That it might still be set in the Gotham City Christopher Nolan has created. There is also the possibility that the established cast could stay in the roles.