I was about to start almost the same thread about Drow DLC & ofc Upper city\Avernus DLC
As for Drow themed DLC...I think it should be great, not to mention how little attention Drow get, the only good Drow themed game was NwN: Hordes of the Underdark, which combined 3 awesome themes, Hells, Waterdeep & Underdark, how cool is that? Wish we can have an expanshion like this...
Anyway, why not Menzoberranzan? Its population is like x4-5 times lesser than Baldur's Gate population. Menzoberranzan could be introduced in Expansion.
Before I was thinking about Nine Hells\Avernus\Snow themed DLC but Underdark should be much more interesting, not to mention how beatiful Underdark and how unique Drow culture is...also Beholders, Mindflayers, Minotaurs, Driders, etc such a great enemies, classic.
As for Driders...Larian made a custom skeleton, single model just for 1 drider character...it's great but usually such things happen when Devs plan to use such skeleton\model in future projects, so yeah, there is a small hope for Drow themed content
As for the rest DLC stuff:
1. Transmog
2. Magic Mirror
3. Crafting(looks like a cut content)
4. DLC which brings back as much cut content as possible
5. Endless dungeon DLC could be nice as well. Hello to Pathfinder
