Err .. and who says BG4 will even happen ?!?
We dont know what it is, but we know Larians next game will be SF.
Who said BG4 was going to be made by Larian?
Heck, I'm hoping BG4 is made by someone other than Larian, given how much Larian aren't fans of DnD rules.
Killing the rats happened in Candlekeep, not in Baldur's Gate city.
Technically, it was redone in Dark Alliance in which case it was in the city. Specifically, in the cellar of the Elfsong Tavern.
On topic:
For a BG4 game, it would be nice to have Baldur's Gate city be the main hub for the game. Like, you start out there in Act 1 and get to explore the place in depth. Then for later acts you branch out into neighbouring areas and/or portal to different locations (Like the Underdark, Avernus, Astral Plane, Far Realm etc) - But with the city being the place to replenish supplies and having certain things progress as you go through the campaign (Depending on the particular story - Like if it's being beseiged by Mind Flayers, Devils, Githyanki etc you liberate the place over time, or you can have like political things develop, perhaps your party has a bard with them who is writing about your heroics and people in the city hear about you and react differently etc)
Since for a game titled based on the city, it should have the city being a major part of the game. Otherwise you may as well just go with any other DnD setting.
