Miyamoto on Zelda U being open world:
"We used the term to make it easier for consumers to understand."
"I prefer not to use the generally used term “open world” when developing software, but we used this term [at E3] in order to make it easier for consumers to understand. This term means that there is a large world in which players can do numerous things daily."
He does however go on to say the game is vast and a possible non-linear experience (like Aonuma discussed) awaits:
"In the traditional “The Legend of Zelda” series, the player would play one dungeon at a time. For example, if there are eight dungeons, at the fourth dungeon, some players may think, “I’m already halfway through the game,” while other players may think, “I still have half of the game to play.
” We are trying to gradually break down such mechanism and develop a game style in which you can enjoy
“The Legend of Zelda” freely in a vast world, whenever you find the time to do so."
http://uk.ign.com/ar...ii-u-open-world