I was once opposed to new control mechanisms in Zelda, but I've since become a 100% supporter. I really want to see them change the formula up as much as possible. Make it a FPRPRTSFPG (first-person-role-playing-real-time-strategy-fighting-puzzle game) and I'll be mega happy. At this point, I absolutely trust Nintendo to do whatever they want with the series. We know it's going to be realistic, we know Link is going to be older, so hence, it may be even more mature. Perhaps it will gain a T rating like TP (most likely) and judging from the difficulty of New Super Mario Bros. Wii (own it, love it, and have struggled a lot with it) and the fact that the Super Guide is included in both titles, I'm sure the difficulty will be upped along with the change of gameplay.
I back Nintendo completely with Zelda Wii. It's Zelda for Wii, the motion-controlled system. It needs to have motion controls! If fans don't like it (Nintendo will still make boatloads of money) they can work out the kinks with the next game. Also, seeing as how DLC is possible on the Wii now, if Zelda Wii featured some extra dungeons, items, etc, that would just be superb.
Also, seeing as how Nintendo is trying more and more to incorporate multiplayer into the Zelda games (and others like NSMBWii), I really don't think it's unlikely to see a multiplayer mode in Zelda Wii, be it co-op (playing through the whole game -- oh my God that would be the best thing to ever happen in the history of gaming), versus (second best thing), or what have you (...third best?).