This is really a surprise, but I have to wonder ... What is the point?
Is Sega really in such dire straights that they have no original IP left that they haven't demolished, and no creativity to come up with new IP, that they've got to put Sonic in everything?
Yeah, I know BioWare is involved and all of that, and I'm a huge Neverwinter Nights fan (and honestly, since the d20 mechanic is open source, BioWare could use that system for any RPG they create), so I'm sure the game won't completely suck, but frankly, I'm just all Sonic'ed out.
At the very least, hand BioWare the keys to the Phantasy Star franchise/universe, and get the hell out of the way. Phantasy Star DS with the WotC d20 system as used in NWN ... now THAT I would line up for on launch day to buy.