In a report by IGN, Dragon's Crown publisher, Atlus, revealed they will be adding Cross-Play functionality in an upcoming patch. Cross-play is the ability for PS3 players and Vita players to play together; something not previously available.
In update 1.04, Atlus reported to IGN that the "Cross-Play compatibility for cooperative AND versus play" will be coming to North America "very, very soon."
Guess we'll wait until "very, very soon" happens. For our thoughts on Dragon's Crown, read our thoughts about this flawed but awesome Vanillaware game here.