I can't imagine the city looking too lively. So far in BG3 NPCs are pretty static, so I can't imagine the city of Baldur;s Gate feeling much alive by modern standards - and who knows maybe Larian will pull the card of "city under attack" again, like they did in D:OS2.
If anything, I think BG1&2 got a way with a lot thanks to nice ambient tracks - those created an atmosphere of crown and liveliness that wasn't present in actual locations. Later games never replicated that, even PoE2, which IMO has one of best cities in isometric RPGs.
As to OP: I doubt we will see the city of Baldur's Gate until 1.0. As far as campaign content, what we got is most likely all what we will see.