Is there any precedent for the design of BG city from large settlements in previous Larian games? Regardless, I'm not a huge fan of Larian's world/map design in BG3 so don't hold too much hope.
Also unless they implement the much requested day/night cycle, it will be patently ridiculous to only experience the city in permanent midday sun. Having certain areas at nighttime would be a half arsed effort if they decide to go down that route.