I still wonder what happened, considering the cut things were promoted in June.
To be honest, I came away from the Baldur's Gate intro trailer in June thinking that we'd only get to visit the Lower City, so I was surprised to read we were getting other areas too. I'm still only at Wyrm's Crossing, but had always expected that if we were going to get to the Upper City it would just be the odd little bit of it, otherwise we'd have seen more of it in trailers. I guess I'll see if I was right soon!
There was one oddity in Community Update 19 that I noticed at the time, in that the Steam version referred to the city being made up of three seamless open worlds (which I think people might have assumed were the Lower City, Upper City and Outer City though I don't think that's stated), whereas the version here doesn't give that number. Until I've actually explored the city more, though, I'm not sure whether that quoted three looks justified, or whether to hypothesise it was included in error in the Steam update.