In a recent IGN article:
"Speaking to Wired, legendary game creator Shigeru Miyamoto says he likes to keep his Mario games light on story and focus on gameplay, while leaving storytelling to the Zelda franchise. "
Here's a link to the article: http://wii.ign.com/articles/994/994699p1.html
They're giving Metroid other M a story, so why not Zelda?

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You know what eats large amounts of the day are naps. You go to sleep it's light out, you wake up it's dark out, that's the whole day. Where did that day go? I have no idea