Square Enix has a huge library of intellectual property or "realms" and it appears one of them may be reborn soon. In Europe, Square Enix filed a trademark for A Realm Reborn, which sounds more like a tagline or subtitle than a brand new game.
Could this be the subtitle for Dragon Quest X? Dragon Quest X: A Realm Reborn has a nice ring to it and kind of fits since player characters will be reborn as one of the online game’s five races. When Dragon Quest VI came overseas it got the subtitle Realms of Revelation too, but hey this doesn’t have to be for Dragon Quest. It will be for a Square Enix Japan IP though, since their Japanese division registered the trademark.