We know that Quantic Dream is working on a PS4 game, but basically nothing is known for sure about it. Yet, Founder and Creative Director David Cage had something to say about it in an interview on the Obsession blog of Le Nouvel Observateur:
We’re working on something very exciting, but I can’t say more about it. We try to create different things, that leave the beaten path, always with the same passion.
PlayStation Experience is only a few days away, but there’s no confirmation of a presence of Quantic Dream at the show yet. We may have to wait longer for a reveal of their new game, unless Sony wants to surprise us, of course.