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

[pokoko]

SvennoJ said:

But that's fast travel. I assume fast travel still has a loading screen, as well as dying. Or maybe there is no fast travel.
I do hope it's not for houses. I tend to avoid going inside them when it means a loading screen like in Skyrim.

It's amazing how such a minor thing is so annoying.  Multiple transitions are something I dread so much despite not really being that long in reality.  I would always put off Thieves' guild missions in Skyrim because it required TWO(!) transitions to go in and out of the tavern.  

And, even though they take just as long or longer, I much prefer methods that hide transitions, like elevators.