Here's some speculation on the The Legend of Zelda GCN. No of this is confirmed true, so please do take it that way. If you have speculation of your own e-mail me
-The story in this game seems to be on a grander scale than previous games. Maybe this is a time of war.
-From the trailer, day and night seem to play an important role, not only is there the sun or the moon in every shot, but the temple Link is in a fire temple (maybe it's the "Sun Temple") The words that appear on the screen also hint at this theory, but that could just be a fluke.