Just a reminder to not get too hung up on what the trailer shows or doesn't show about BotW2's map. In several of the first BotW's trailers, the Deku tree wasn't even visible on the horizon, but it was on the latter trailers.
The game's still, at the very least, a year away and in that time they could make significant topographical changes or additions to the land.
Yeah I kind of wonder if any of the shots here are possibly meant to mislead. Not so much to get players to contrive their own setting theories as much as to prevent them from knowing what will actually happen. For instance, would Nintendo show anything that actually isn't part of the real game (at least not exactly as they showed it)?
More than anything I want answers to 'will the main landscape change,' as the landscape was hands down the most important actor in the game. Nintendo is keenly aware that fans have been playing in this world for hundreds of hours because they continue to find new things as they explore, but many of us have well and thoroughly exhausted that feeling. These islands in the sky look to accomplish a degree of that same feeling - i.e. looking up and seeing 3-4 places you can go and wondering 'what's over there', but it's a far less organic design when compared to a completely open and connected landscape. And even with that, if they have players spend a large chunk of time retreading the overworld to get to these islands that'd be such a major blow to the design.