For the New 52 the main Justice League title was the main flagship comic if you wanted to follow what was going on in the DCU with all of the events spinning off of that. So far with Rebirth I don't see a title filling that role. I'm wondering if any of the new comics are eventually going to fill that role or if DC will just let things be more free flowing and not have one title dictate what all of the other books continuities' need to follow.