Sega decided to continue the love for Sony consoles by announcing Phantasy Star Nova for the PS Vita. Phantasy Star Nova is an original game that will take place in the Phantasy Star Online 2 universe. The announcement is presented as a pre Tokyo Game Show announcement. So, few details are known. Given that PSO2 is still lacking any details of a western release, I suspect Phantasy Star Nova will have the same fate.
Sega did announce that four players can join together in an ad-hoc connection.