Rhapsody: A Musical Adventure. RPGamer asked him if the game was coming out, and he said "Rhapsody ~A Musical Adventure~ is coming to the Nintendo DS here in North America." This is the only time in history that just asking about an unannounced game resulted in a definitive answer.
There's no date yet, but the Japanese version isn't out until August, so we'd expect the holidays at the earliest. Localization and voice recording take time (unless they're using the existing English script), and getting Disgaea DS out will probably take priority for NIS. We'll find out more about the company's plans on the 6th, when NIS will hold a press event. Niida promises "surprise announcements," which could be anything from Jigsaw World (fairly likely) to The Combini (pretty much no chance) to non-DS stuff.