Annoying portal sound!
ETA: I ran back to stand beside the Org portal in the village and I can now hear TWO loops of the mage portal sound playing. Not sure if that's valuable info or not, but there it is.
Try turning off reverb mode and death knight voices in the Sound options
If it comes back toggle the death knight voices on / off again.
Toggling the options forces the sound system to restart.
I can't get it to happen again, though. I ran back into the zone and all the way up to Honeydew but nothing happened. So I tried re-creating the issue somehow and nothing worked. Maybe they fixed it.
Edit: I found these two threads as well that are a bit more helpful:
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