i dont know if you have this up but the guy in the second trailer, first post, says that skyloft is the biggest island in the middle. he says so around 1:35. this implies that the town of skyloft is in the middle of the accesable sky area
Actually, this was a bit of a worrying thing for me. I had the idea that perhaps Skyloft would be a hub world that Link leaves through portals into little areas like levels in Super Mario Galaxy or whatever.
Luckily, that doesn't seem to be the case.
He does state that Skyloft is the central town, and it's on the biggest rock in the middle, and there's scattered rocks all around a sea of clouds. So it does appear as if it is the only, and therefore largest notable thing in the sky.
The interviewer asks if it's gonna be a hub world, but then the guy says that there is a "whole world to explore" down below, so it's win-lose. The sea of clouds is more like one town with several floating rocks around it, whilst the underworld is a fully realised world to explore. I'll update the page.
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In other news:
I've deduced that the Forest Area from E3 2010 appears early in the game.
We already know that the Sky Temple at this year's E3 is the first dungeon in the game.
From what we know, we can roughly get this timeline.
Introductions
Bird Rider's Ceremony
Filler
Zelda goes down
Link prepares, gets a sword, probably the Skyward Sword (I wonder what the reasoning is for the green tunic he receives this time?) Me thinks the Rauru-looking guy holds some info.
He goes down, probably into the Foresty Area
He enters the first dungeon, the Sky Temple
I'll update the first post.
For my reasoning, here's a blog that Locke wrote up:
http://zeldadungeon.net/forum/entry.php?368-Skyward-Sword-Symbol-Analysis&bt=2051