If the Cat and the Moon and Sun Birds are hints to the next Expansion and An’she is the Vassal of Life then An’she is no better than the Amathet who draw on his power.
Now who could An’she be allied with to betray the Pantheon of Life?
Of course I’m banking on Life itself as a Cosmic Entity who wants to break out and consume all existence.
Al’firim the Broker suggests that all Cosmic Forces originate from singular entities forcefully brought together and the name of the Sepulcher Zereth Mortis is so similar to Azeroth which Sylvanas calls a prison implies that the First Ones(whom Blizzard states created the Cosmic Realms) imprisoned 6 Cosmic Entities(with the 7th AKA lurking within the Pattern itself) in order to keep them from destroying existence!
I also expect that we will resolve the Naaru matter in the Gardens of Life Expansion and not the Light Expansion considering the Naaru are heavily indicated by Light’s Heart’s reaction to the Tears of Elune to be creations of Elune.
If the Darkness that grew to fill the hole in Sylvanas’s Soul is indeed a Cosmic Entity in of itself and due to Anduin constantly being drained hijacks Zovaal and those he used Domination Death Magic on in order to grow in power then Zovaal’s demise and the end of Domination would result in the Darkness being banished along with his power to whichever Cosmic Realm spawned it.
Of course if the Darkness like Shadow comes from the Void(and that’s assuming the Shadow comes from the Void and not the Veil AKA Realm of Shadows) then the Darkness can easily hijack the Naaru just like the Void Lords do once it reforms using the power it acquired while hijacking Zovaal.
All Naaru being hijacked(just as Amon hijacked the Khala) would be reason enough to go to their creator to fix the problem and thus bring us to the Gardens of Life… Of course Elune’s solution might just be to shut them down long enough to kill them leaving the Light with only the Lightforged and it’s own native denizens which we know nothing about.
As for what I think the First Ones are: If we treat them as being similar to Babylon 5’s First Ones then their oldest members are the First Born. Protoss call themselves the First Born in StarCraft 2 Legacy of the Void…
Yes I’m insinuating that the First Ones are the Protoss(First Born), Zerg(Shadows) and whatever race resembles the Vorlons with the 7 Cosmic Forces being Xel’naga with Amon’s remnants within the Protoss being drawn into the fabric of their Cosmic Realm prisons for the 6 Xel’naga thus resulting in the Darkness lurking in all Souls which first reared it’s head inside Sylvanas.
Of course that means Amon will first hijack Zovaal and his forces then hijack the Naaru(necessitating a visit to the Gardens of Life to meet their creator) once Zovaal(and Amon’s brother/sister Death/Azeroth/Zereth Mortis) falls banishing Amon back into the Void(which has a link to Naaru) now that he is sufficiently revived.
Marvel Comics combined it’s own franchises as did DC Comics so Blizzard doing the same thing is not hard for me to imagine.