Sega and tri-Ace are teaming up to make Phantasy Star Nova. This PlayStation Vita game is set in the same world as Phantasy Star Online 2, but you can play it offline. There is a single player story too follow and ad-hoc play for up to four adventurers. The trailer says Phantasy Star Nova will have the biggest enemies in the series. The Gigantes monsters look huge.
Phantasy Star Nova is slated for release in 2014 for PlayStation Vita.