I found this thread on the official forums: Guess the next Old God from Cthulhu mythos?
Currently Cthulhu/C’thun and Yog-Sothoth/Yog-Saron have had callouts in the game. But who might be next?
We were discussing this last night (as we wiped again on General Vezax in 10 man). Opinions were split between fan favourite, The King in Yellow — *coff*Hastur*coff*, my favourite, Nyarlahotep, or my husband who thinks that the Shub-Niggurath (the goat with a thousand young) would make a cool raid encounter.
What do you think? And as an aside, why haven’t we had the Hounds of Tindalos in an encounter yet? Beware the corners ….
Welcome to Spinksville! 
Are you kidding? We’re going to the Emerald Dream, and that means that the old god of choice has got to be the boundless daemon sultan Azathoth, whose name no lips dare speak aloud, and who gnaws hungrily in inconceivable, unlighted chambers beyond time and space amidst the muffled, maddening beating of vile drums and the thin monotonous whine of accursed flutes.
I mean, obviously. >.>
Oh no, not more piccolos ((loses 2d10 SAN))
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I’m pretty certain that the next expansion will be water based given that big gap in the map that is the Maelstrom.
If that is the case then I would expect to see one of the old elemental lords/gods Neptulon the Tidehunter involved somehow.
http://www.wowwiki.com/Neptulon