At E3 2014, Anouma discussed the changes for Legend of Zelda Wii U. Some of these changes are the vast world as seen in the original game. With the larger world, players will see that sense of exploration. Difficult enemies will still appear in this peaceful world.
Here is some additional info from Nintendo:
The newest game in the franchise, scheduled for 2015, introduces the first truly open world in a game from the series. Players can roam Hyrule Field or set off on a trek to distant mountains if they prefer. Players can get to any area they can see from virtually any direction. That’s one of the ways the game breaks with franchise norms and introduces new ways to play.