A now-removed listing for Disgaea 3 Return was spotted on Yahoo! Japan. More Disgaea? No kidding! Interestingly, the title was listed as a launch game for PlayStation Vita.
Nippon Ichi Software has previously gone on record to say that development is happening internally for Sony's next handheld. I could more or less see NIS' entire library meshing well with Vita, especially the Disgaea series. Throw in some extras, and you're looking at an easy sell.
Rumor: Disgaea 3 Coming To PlayStation Vita [Siliconera]