Every expansion since legion has been a sequel and finale of an expansion theme that came before it. Obviously there's a lot of connective tissue connecting all the expansions together, but each main theme is covered and concluded by two expansions as it stands
TBC - Legion: Burning Legion
Wrath - SL: the lich king and Death
Cata - Dragonflight: dragons and the elements
MoP - BFA: faction conflict fueled by old god shenanigans
WoD - ???(11.0)
Now what happened at the end of WOD? The small legion incursion was defeated and AU Draenor was left to its own. Fast forward to BFA and the maghar recruitment scenario shows us what's happened since.
With the lack of a legion to keep the Draenie occupied, the AU Draenie became zealous and turned into the AU version of our light forged, the light bound. Led by, Yrel, the Alliance rep for the WoD campaign. They created a campaign to unify Draenor by force with the help of the light mother, AU Xera.
We subsequently left Draenor with our new Allys.
So what does this mean?
Well if the expansion sequel pattern is to continue then that means that 11.0 is a WoD sequel.
But how can we even deal with any light bound incursions if they're all stuck back an an alternate time line's Draenor???
Hmmm, well if only DF had characters who are greatly attuned to time and time travel.
Oh wait, it does. For those who've payed attention to alpha, Murozond has been hinted to be a major player of DF and possibly the end boss.
I believe that Murozond will infact by the final boss, create an infinite army to help against the void. We defeated him but he manages one last ditch effort to summon an army who might stand against the void, Yrel and her Light bound army.
This is not head cannon but an educated prediction.
Is this pattern BS? Perhaps. But 4/5? Come on....