The narration in the extended look was doing something I have not seen before

It was not a voice explaining features. It was not a character speaking either. It sat somewhere between a documentary voiceover and a person describing a place they know.

Most gameplay reveals have someone telling you what you are looking at because they do not trust the footage. This one had someone telling you what the place is like, which is a completely different job, and it meant the footage had to carry the mechanics on its own.

Confident to the point of arrogant, and it worked lol