It has yet to be announced. I would think once the final #52 issues arrive on the shelves an official release will be made as to what comes next with the Rebirth titles. With the Justice League movie in the pipeline though be sure that the traditional JLA line-up of Wonder Woman, Aquaman, Superman, Green Lantern etc will stay in place.
The only question will be who the new/old menbers will be who join - i.e. Martian Manhunter, The Atom, Hawkman, ... Elongated Man and Sue! Well I can dream.
And while we're at it, whatever happened to Vibe...?
I just hope the roster is the traditional Superman, Batman, Wonder Woman, Green Lantern (Hal), Flash, Aquaman, Cyborg, and Shazam roster, as seen in the upcoming movies. But I don't mind seeing the likes of Martian Manhunter, Green Arrow, Black Canary, Atom, Hawkman, and other popular Justice League members who have potential being added as well.
As for Vibe, I don't know where he is these days. For all we know, he could be dead or retired. My question is whatever happened to the Hank Heywood Steel from Detroit? Did he get a New 52 introduction?