I love this. I loved the world of Breath of the Wild but it was not without flaws. Being in the same world means that they can just keep adding more great content to an already amazing game world. People complained that there weren't enough enemy types, now they can fix that. There were relatively few sidequests, and now they can make more. Most of the story took place in flashback sequences, and now they have a chance to craft a whole new story that your can interact with yourself.
Pretty much. I'm not just fine with this, I'm all for it. There was so much untapped potential in that Hyrule - there were two whole areas in Hebra and Faron that went by with mostly no meaningful content besides Shrines and Koroks -, that alone is worth a second trip.
But I think there's definitely gonna be loads of new content. It's the same place, but obviously we're going deeper in this time. And there are surely going to be new areas, too. Personally I'm not sure I'd be down for another open world in Zelda this soon, but there was a lot more to come from this Hyrule so this was the right choice in my opinion.