Originally Posted by
Kralljin
I'm not sure if the next expansion will be Old god related (at least heavily), BfA's final boss will most likely be N'zoth, so we have the final Old God on Azeroth about to get killed.
However, with dragons being brought back into the spotlight for some time in 8.2, i can see a Dragon related expansion on the horizon.
Blizzard flat out said that the stuff hinted in Island expeditions is stuff for the future.
With Dragon Isles being canonized, both Black and Twilight Dragonflight on the rise again, those are really decent hints.
I, for one, could see an expansion with both Twilight and Black Dragons rising up again, perhaps we also get to see some other "rogue titan forces".
"Evil" Tol'vir are on the move, they have according to the Tol'vir in Uldum a new Forge and churn out new Titan Keepers.
Mogu forces are also not entirely defeated.
The idea that the next expansion will be about some alliance of Mogu & Tol'vir (alongside other Titan related races) with (Twilight / Black) Dragons on the front is my guess for the next expansion.
Perhaps not as the slave to some unknown master, but simply as a force that wants to "free" Azeroth (Think of some mixture of Wrathions and Lei Shens philosophy) from us after we nearly ruined it during BfA with our exploitation of the Azerite.
And Dragons by itself is an extremely popular theme for RPG's such as WoW, whether as enemies, allies (or just mounts), Dragons just work.