We should be cautious about this, especially because it was reported by DS Fanboy. Apparently, according to a report in Nikkei, Sega will move development from the PSP to the DS, and will even make something that will "surprise absolutely everyone." I wish I could confirm, but my grasp on the nihongo isn't too great.
But Sega will be wary, of course. Nintendo's platforms have been notorious for being great for Nintendo games, not really third party ones. "We [Sega] have to do a lot of thinking about titles for Nintendo's hardware, because Nintendo's own titles are extremely strong. It really is difficult to sell a title as a third party."