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

[Ljink96]

Pavolink said:

Ljink96 said:
So I expect that going into houses won't require loading times either, that's great. I kind of hoped it would be like that after seeing the woodcutter's house in the demo. I know Nintendo's hiding so much from us, can't wait to see what this game has to offer!

Not going to happen. We already know that for entering a shrine there's a loading screen (with tips, and the loading bar is the Zelda BotW logo). It's likely going to be the same with houses.

Yes, but shrines are entirely different maps. Houses can easily be loaded based off x,y, and z location proximity to a building. It's just more geometry to load and more textures but other geometry and textures can be set aside for this. It'd be kind of weird to load shrine map data in the overworld and have link teleport to that area, those are most likely separate maps that have to be loaded.