It's coming out for the Wii. This will be the last Nintendo Wii game made by Nintendo themselves, without a third-party company assisting them. Or, so I've been told.
Yeah, it's coming out for the Wii, and is reported to be currently in the localization phase and soon to be set for release, though, no definitive date has been announced. Here's an article from IGN that summarizes an interview with Eiji Aonuma, Miyamoto's partner in crime, himself. There's also a video of the interview.