I know we're all geeking out about Guardians and Dungeons and all that jazz but can I take a moment here to praise the brilliant design of the Great Plateau.
This is the BEST tutorial for an open world game ever. Most open world games feel like you are playing a completely different game, a linear one, in the tutorial area. You are walked through every aspect of gameplay. Here's the bit where you pick up a weapon, here's the bit where you sneak, here's the bit where you use a bow.
Breath of the Wild, on the other hand, basically gives you a miniaturized version of an open world game that you have to complete and explore as a place where you can naturally learn everything about the game: the importance of camp fires, various ways you can stay warm, the value of cooking, various fighting techniques, the usefulness of fire, all the ways you can use your runes to your advantage to approach all these camps in unique ways.
And it does all of this with minimal guidance. You are being taught to play this open world game by giving you an open world setting to experience, one carefully balanced in difficulty and density so that you are never overwhelmed nor bored.
I love open world games, always have. But in terms of game design, this feels so much better than the openings of Skyrim, Oblivion, Xenoblade Chronicles, and even Xenoblade Chronicles X. The game teaches you, but you never feel like you are BEING taught.