The DS version came out after the PSP version, it has all the additions of the PSP version but also added the ability to recruit Pleinair, Adell, Rozaline and Badass Freaking Overlord Zetta (Tome form of course), Plenair in particular can be unlocked as early as a New Game + if you lose to the first Mid Boss fight. It also allowed you to speed up the Geo Effects at lightning speed which was not present in the PSP version, Prinny Commentary which is also unlocked with New Game + and added a PvP mode.
However the downside of the DS port was a downgrade of music quality, minor downgrade to graphics and no voice acting beyond the opening cutscene. It's not too bad of a drawback and I enjoyed the game immensely even then.
So yeah I'm kind of hoping they include some of the DS content, at least Pleinair and the Geo effect speed up.