It would be nice if they build an entire city to explore
I'm optimistic about getting a large open city area to explore. I'm sure they will be lively and vibrant like Cyseal, Driftwood, and Fort Joy. That's in contrast to how NWN 2's Neverwinter had only a few great spots like Moire's warehouse and Merchant Quarter, but otherwise was so cookie-cutter, unfocused, and unimportant.
We certainly got a few rooftops in the new teaser! A fight plays out on what looks like a town square, and there are characters on rooftops. This is more roofs than I could ask for and it looks fantastic from top-down. But why use the same tile for every single roof and the same plank for every single wall in town?