In my opinion what Zelda Wii will be and what I hope that it is, is THE game that shows the true potential of the Wii. That means both controls and presentation. The game will be your standard Zelda fare but it'll have a heavy emphasis on motion control and it'll be a gameplay revolution. That's why I think Nintendo have chosen (as far as we know) the whole Master Sword back story.
Both the story and the gameplay will want you to feel like you are in control of the Master Sword. I think it'll have more in common with The Legend of Zelda (NES) than it does with Twilight Princess. It'll make everything feel like an adventure more than any game in recent Zelda history because everything will feel fresh.
I can guarantee that it'll be GOTY 2011, taking down Modern Warfare 3 quite easily.