Since we now know, thanks to Luca, that they use the World Builder for these worlds I’ll share this:
The profile and lighting are tied to the world node. I believe profile only has to do with the resource distribution (full list can be found at the bottom of this post). As you can see, biomes have a spot in the generator which is separate from the profile.
Also for the trailer, @BabyCookie, do you mean this one?
