Eiji Aonuma has confirmed that The Legend of Zelda: Breath of the Wild will have no Loading Screens in the Overworld!

[TomaTito]

Except shrines so far.
Posted a few loading times two days ago.

Loading the overworld takes around 30s
https://www.youtube.com/watch?v=qadzCB3CLlI&t=4h23m50s

Restaring after a death seems to be around 15s
https://www.youtube.com/watch?v=rfK3jmdNVtQ&t=4m15s

Shrines looked around 10s, although that loading time should depend on the size.

irstupid said:

mZuzek said:

Yes, I remember from the E3 gameplay there are loading times going in and out of shrines, and they were... actually kinda long (like at least 10 seconds). Still, I guess it's only a minor nuisance.

Hmm. Was E3 Wii U build I imagine. So hopefully only a few seconds for Switch then.

But either way, Shrines seem to be one and done things, so that's not so bad. I don't see any reason to ever re-enter them, if you even can after beating them. So no load times in the rest of the game is steller then.

During E3 we saw in the opening area a shrine that had an inaccessible chest with Link's current tools. There could be some backtracking if you want to get anything.