Zelda U looks simply amazing! The huge open world is such an improvement over Skyward Sword! I like it!

I don't think Epona is "auto", and you can still control it 100%. It's just if you don't steer you won't run into trees and will just run randomly because of it; as a normal horse would. 

The open world was crazy big though. Looked about the same size as GTA V from here.

Oh yeah definitely, my "pre-show un-hype dance" was not needed. I wasn't sold on staying up until whenever for it but I'm glad I did.

Conegamer already said it, but I'll do it again: If you look at one of cycycychris' screenshots, this one

You can see the legend with the buttons that control Epona. I don't know what they say but it seems obvious that the left stick is to move Epona, the right shoulder button may be the "autopilot" on/off button and what it looks like the A button to make Epona walk or run.

I must say that I would have preferred a traditional trailer but I¡, ok with this. And unlike others, I don't mind the emptiness of the world... I mean, yes it is good to have things to do, but there doesn't need to be things to do/enemies to kill everywhere, right?

Indeed. As for the emptiness comments; if people seriously think that Nintendo will release the game as it looks right now, then they've got another thing coming.

I agree that Nintendo will add more things, but what I'm trying to say is that if you make an open world game and fill it up with enemies or things to do, as a player I usually end geting tired of it. Like, "For God's sake give me a place to just stay there for 5 min without having to do nothing!".

Also, the video has a lot of cuts, so either Miyamoto and Aonuma talked to much about off-topics or Nintendo decided that they didn't want to show us most of the world yet. They could simply have choosen the less stressful (or more boring, that depends on you) areas to do what they wanted to do, show how big the world is an the on-horse mechanics.

This is pretty much what I've been trying to explain today. The video wasn't to show the finished game or the combat/dungeon/enemy design, it was to show off how big the world is, generate hype and buzz and steal the show. Which they did.

there's no downgrade, dude. and no auto horse.

I don't get people complaining about emptiness in the game. first of all it is not done and second emptiness is realistic! you can't expect to find people, enemies or caves/dungeons every step you take!

Some complain because it's Nintendo and others because they are never happy with what they have.