So! Was poking around the Hearthstone wiki and found this piece of artwork:
http://hearthstone.gamepedia.com/Fil...ector_full.jpg
That is a humanoid Sha, working for one of the big three factions in 'Mean Streets of Gadgetzan'. Described as "super evil, super old, and super greedy, and is rumored to whisper the name "Shaohao".
And yes, I know the stuff depicted in Hearthstone is separate from World of Warcraft lore as a whole... but there's no hard rule that anything new introduced through Hearthstone can never be a part of primary WoW lore. If some element created for Hearthstone is awesome enough and can be made to fit (and in a universe like Warcraft it is very easy to find some kind of viable justification to make just about anything fit), then why not try and include it?
I've been of that opinion for a while, and Shaku is just the latest being I've seen that would be awesome to have in WoW, and the one that finally pushed me to make this thread. Hearthstone is pretty jokey and comedic sure, but a sentient, humanoid Sha entity that can endure the demise of Y'Shaarj's power and the other, more monstrous Sha... that'd be pretty serious, actually. The entire series has a number of cool creatures - a fully sentient variety of virmen, some kind of evil troll warlock-druid that can turn into demons, the Kabal faction of arakkoa, blood elves, and various other sorcerous types seems pretty interesting.
I think it would be worth migrating over a few Hearthstone concept into WoW, don't you?
edit - BTWubs, you can get a better idea of what Hearthstone concepts are introduced by checking out the full art galleries here: http://hearthstone.gamepedia.com/Full_art