Earth Defense Force 2017 release on the 16th January in Europe as a digital only game.
http://www.pushsquare.com/news/2012/12/earth_defense_force_2017_portable_invades_europe_next_month
http://gamrconnect.vgchartz.com/thread.php?id=130023&page=1# Official Playstation Vita Thread! Come in and join!!!