NIS America has released the trailer for Operation April:

NIS America is excited to announce that the dungeon crawler RPG, Operation Abyss: New Tokyo Legacy, is arriving exclusively for PlayStation®Vita in North America on April 14, 2015 and in Europe on April 17, 2015! The title will be available as both a physical and digital release. Fight through the Abyss and battle against the Variants—but only if you dare!