One thing Aonuma was very clear on was the direction the development team took in terms of the game's layout. The new Zelda is going to be completely open-world (think Skyrim, only with much more vibrant colors). That means there will no longer be sectioned-off areas of the world. There won't be any loading screens when you walk from Hyrule Field to Death Mountain, and there won't be predetermined entrances to outdoor locations. You can enter any area from any direction.
This open approach to the world design came from the roots of the Zelda series. Aonuma explained that the original Legend of Zelda allowed players to feel like they were exploring a vast world; now, the Wii U's Zelda will be bringing that feeling back with the open-world environments. Also, the world appears to be bursting with life. In the trailer, you can see a sheep herder and his animals grazing in the field, a ship's mast in the distance, and chimney smoke rising from a nearby house.