A clip has been located that reveals the Legend of Zelda Skyward Sword Intro Video and Title Screen. This video is in Spanish but there are text translations provided in the video.
While this clip is short, there is a lot of information that is provided. The intro is done in a very artistic sort of way (much like the game’s visuals), but it provides a lot of potential insight into the back story of Skyward Sword.
Translation
This is a story passed down by the people since time immemorial. (Fi speaking)
2 – The history of the most cruel and ferocious battle ever seen.
3 – From the bowels of the earth emerged the pure essence of evil.
4 – His brutal attack plunged people into their worst nightmares.
5 – The evil forces razed forests, dried up rivers and murdered relentlessly.
6 – They desired that which the Goddess protected, ultimate power.
7 – Absolute power… In other words…