They're a race that doesn't even make sense.
Old Gods corrupt them with the curse of flesh only for their servant Deathwing to undo it. It just doesn't add up.
And we probably won't see them again, just like the forces in Outland doing nothing. How can Khadgar, Danath and Nazgrel completely ignore the war between the Horde and the Alliance? Nazgrel was Thrall's right hand for a long time, now he's just ignored. And that's just naming a few, there's countless more.