Just to add something there Gnlogic, there was a recent reveal about what the sha actully are, and I'm willing, or hoping, to believe they are not old god related at all, but something else. As it was said, the sha is what the last emperor of pandaren released from himself in finding his inner harmony, and when he became one with pandaria itself, he locked the sha away under its surface. They only manifest due to others negative emotions, so its not old god in nature, just something else.
At least I hope its not... then again, looking at the glass window in ulduar, meh..