Yesterday, the Portuguese Hearthstone Twitter posted this picture:
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The Vale of Eternal Blossoms is the resting place of Y'shaarj
Icecrown Citadel correlates with Yogg-Saron
But what about the Dark Portal? This picture is of the Blasted Lands side (because of the red sky), and there's an Old God there. I don't know what kind of implications this has, or if this is N'Zoth or even a different Old God, but it could have affected a lot of things. Perhaps this is the God the Gurubashi worshipped?