Akira Himekawa, the authors of the official Legend of Zelda manga, are currently working on a Skyward Sword manga. Of course, bits and pieces of the plot will be altered in order for it to be more fitting of the manga format, but I've seen art previews, and I'm glad to see a return of their art style used in the Ocarina of Time manga. "This new has just filled my heart with rainbows!" Haha...
Anyways, yes. Also mentioned by others, there is also an official book that covers a lot of mysteries to the series as well as each of the games. I can't remember the exact number, but if I recall, 20-some pages are just for Skyward Sword alone!
But it'll be a little while before they are translated, reformatted, touched up, and published in English. I mean, the game hasn't even been released to the public for a month yet.