This could be made up, but I just read that world-soul on Azeroth is actually the name of a new Titan in the process of maturing into a physical form.. The Patheoens have been looking for there kind for a long time. Another Titan.. could it be that this is why we have to find the Pillars? This new being will help fight Sargares for us? And I think this is the whole reason the Burning Legion wanted to open the portal over there. I'm mind blown right now, but again could be fake.