Can't complain about no new Vita games this week as a new Disgaea title launches in the US and Europe (on the 20th). The JRPG update from NIS America. The re-tooled game based on the PS3's Absence of Justice will offer all of the DLC and extra content for that game, new touch controls, four new scenarios and new levels of spell.
The Vita has plenty of PSP RPGs to play, but this is the first dedicated one with some decent heritage. A list of trophies for the game can be found here.