Based off of 9.2 PTR there are several plot threads that have yet to be tied up in Shadowlands and beyond.
-Vol’jin + Rezan morphing into a new loa
-Light and Life nathrezim traitors
-Turalyon’s regency
-Wrathion’s quest for Dragon Isles
-Magatha in close proximity to many Shaman artifacts
-The Scarlet Crusade resurgence and Calias child as their apparent hostage
-Azshara looking for the “true throne of power”
-Xalatath xalatathing
-Yrel, the lightbound and their “light mother”
-the disappearance of the new Firelands leader
and the Stonemother hating humans again
These are just some that I can remember that happened throughout Legion, BFA and SL. Hopefully these are all used to populate a revamp with plots across the continents, but regardless which of these plots are you looking forward to the most and where do you think they will go?