I'm pretty sure DC (the comic makers and not our resident pedant) has spoken about how the Nolan Batman films aren't going to play into the JLA universe. Like, Bale isn't going to be back to direct (he's stayed on as a producer but that seems to be so advertising can brag "produced by CHRISTOPHER NOLAN the DIRECTOR of THE DARK KNIGHT TRILOGY") and people were flipping their lids because they assumed Jo-Go Levitt was going to be Bats in the JLA film but that, at the time of release, was untrue as well because they just threw the cheeky reveal in there to mess with the fans.
I'm not 100% but it seems likely because, if the Nolan films were going to play into it then DC certainly would have announced official plans for JLA (release dates for their pre-JLA films, some casting maybe) with Dark Knight Rises release last year instead of flailing in the water like they are just now. To consider that they are talking about 2015 and going head-to-head with Avengers 2 and yet have announced NOTHING official is crazy, especially when you compare to Marvel's Phase 2 (and even Phase 1). With all that in mind I'm expecting, with a huge opening weekend for MoS for DC to come out soon after announcing everything including a new, tone-correcting Batman film that steps away from Nolan's universe. Because, as Hancock says, the Nolan films make no sense in a JLA universe. None at all.
As it is with Man of Steel, I'm incredibly sceptical but boy-oh-boy do I like Michael Shannon. I mean, holy moly would I marry that man. He's absolutely one of the greatest things since sliced bread and I've tried sliced bread. Plus I like the music a lot so far especially the march-y "You are not a-lone" beat that appeared in the "Fate of your planet" trailer.