I've been milling over the idea of whats going to happen at the end of legion, given all thats happened so far, and I think I've formed a possible theory.
From what we know, blizzard isn't making a legion homeworld/Argus expansion, which is pretty silly to me, given how the magnitude of fighting the legion on its homeworld should be like the biggest culmination of warcraft. The legion has caused endless grief to so many races across warcrafts timeline, that fighting and finishing them off in one huge battle on its now homeworld would have been epic for an entire expansion.
But I digress, blizzard only wants to make it a patch, whatever. So we should believe that something dramatic should happen in this final patch. Now going back to what I said before, the final battle against the legion should be something dramatic, climactic, and overall have this feel of the denizens of azeroth have had enough of the legions shit, we're taking the fight to them, and ending their shit.
Now in a perfect world, I would have thought the best and most intense outcome would be using portals or soul magic or whatever crap, to blow up Argus, in the twisting nether, killing off the legion in dramatic fashion as we escape through the portals back to azeroth. This would be an awesome outcome storywise, even having certain lore figures staying behind to keep whatever mojo it is going in order to blow up Argus.
But then.. I remembered this isn't a game that allows for such things to occur, this isn't mass effect. Blizzard has never really done anything like that in world of warcraft, and more then likely won't ever, since making the choice to blow up a planet or a location permanently so nothings left, and offers no questing hubs, dungeons or raids, would go against the gameplay itself.
So scratch that idea, most sense it would make, but not within blizzard ability to pull off.
So, I thought what if we're not going to Argus to blow it up. What if we're fighting the legion head on, with intent to kill off its leaders, kil'jaeden and Archimonde, in the twisting nether permanently, and with Sargeras out of the picture as whatever he is now, a ghost? What if all this is leading to the same outcome we did for Wrath.
What if we're aiming to replace the current legion leaders, with another.
But who could this mysterious person be. Who is capable of performing such a feat? Oh who could be so amazing, so godly, so beyond any doubt of his..
yeah its Illidan.
I honestly think their gonna do 'a twist' of having him do a Bolvar and become leader of the legion somehow, controlling all demons.