1. Backgrounds / Factions
Edit: - more (immersive) backgrounds such as Guild Merchant, Mercenary Veteran and Faction Agent
Especially the last two make me curious. Choosing that backgrounds and joining a faction / being a sell-sword for all the mercenary companies would be awesome. There is a lot of potential such as encounters with the infamous Bregan D'aerthe and completing assignments for them and other mercenary companies. The Zhentarim and Flaming Fist are already part of the Game.
2. Excursions outside of Faerûn
I would also like to make small trips to other areas. BG 2 and IWD 2 took us to locations in Kara-Tur or the Jungles of Chult. Maztica was also discovered in BG 2, but only mentioned...