I'm sure there'll be some sort of return-to-base item. Most people are too irritated by having to walk 10km return just to drop off some loot. It might not be as flexable as the pyramids, but there's bound to be something.
I think most of the game which do not have return-to-base are artificially made longer: Divine Divinity was BIG. VERY big. So was Diablo. Larian and Blizzard didn't have to make you walk for days, fighting monsters, just to make the game longer.
I hope BD is as big as the previous title.