Personally, I'm holding out for murlocs. Perhaps that MRGRGL sound we've been terrified of hearing for so long was actually a friendly greeting, a request for a hug or even just a handshake. Perhaps making them a playable race would be the first step towards reaching out in friendship to our semi-aquatic neighbors. Come on, Ghostcrawler, if you can't give us naga, surely you can make murlocs happen, right?
But that's probably a long shot. What do you think, readers? Which playable race is going to be headed to WoW next?