I think the producer of Castlevania has already stated that he doesn't think Wii is appropriate for Castlevania...though if the console gets anymore popular i see that changing.
I think it's a little too early to root for a certain third party. Sure, a lot of developers are being quoted saying how cool they think the Wii is, but that was the same for the Gamecube, and even at the height of its popularity most of those same developers threw only Disney and other crappy titles and poorly ported junk to the cube just to fund their real projects on other systems. So it really could go either way at this point. I would say Ubisoft since it seems to be the most gung-ho for the Wii, but at the same time, all of their games seem to be mediocre at best (with the small exception of Rayman), so maybe they shouldn't be so gung-ho and focus on making better games.