"...A land beneath the clouds is discovered, it's ruled by evil forces, but Link is forced to go there. Link has to travel between the two lands in this adventure. The Skyward Sword is his driving force behind his traveling between lands...."
Thisquote leads me to believe that the sword will somehow be used to get Link to and from Sky Loft. There is the scene of him jumping into the clouds, but how he lands is unknown at this point. I figure he either warps once he hits the clouds or somehow the sword transports him safely to the ground. In any case, he is apparantly forced to go to the land below, and you never start out with all your weapons, so if that scene was at the beginning of the game then I think he'll have to rely on the sword since he probably wouldn't have any items yet. Probably. Not definite at all. In any case, I think the point is that the sword plays a role in transporation...
But maybe I'm wrong. Sometimes English confuses me. Maybe "driving force" is meaning the other way that term is used.. uhm, "motivation." Maybe that quote only means the sword is his inspiration and motivation to travel between lands and doesn't have to do with the transportation at all. I don't know. I kind of figure the first idea though...
But what do I know. DX