There is an interview at IGN with BioWare on the Sonic RPG for the Nintendo DS:
IGN: Give us a taste of what we can expect out of Sonic's first RPG. Is this going to be anything like what Square did years ago with the Mario RPG SNES title?
Ray Muzyka, CEO of BioWare: [...] Without giving away too much, we can say that we will be using many of DS's feature sets and we'll really be pushing the limits of what the system can do, always striving to innovate in what we deliver, as in all BioWare games. Above all, we're committed to deliver a deep, compelling, unique and entertaining experience in this first BioWare RPG for DS.
IGN: Now that BioWare's focusing on the handheld market, can we expect to see the "big" BioWare games, like Baldur's Gate and KOTOR going handheld, or should we not hold our breaths?
Greg Zeschuk, President of BioWare: At this point, we are very focused on Sonic - like SEGA, we're looking at this as a title with huge potential. We have not announced any plans to bring any other titles to handheld yet!