I've said it before, and I'll say it again -- and likely again sometime after that -- the new renditions of the old songs are magical. Here are ten minutes of footage with direct feed audio, featuring such hits as The Legend of Zelda theme, Fairy's Fountain, and that old summer hit, Dungeon Theme.
This may be pointless speculation, but if you look on the world map on the DS screen, you see that the map is part of a scroll. Is there any chance, I wonder, that the scroll will "unfurl", revealing the rest of the overworld? Perhaps the LttP overworld is just a big tease, and we're really only seeing a small part of the game.
I'm still not at all worried about the overworld thing. I'm sure there will be new areas, possibly even a new world/dimension. Why put all of those clouds over the map if we all already know exactly what it looks like.