Our tip lines have been buzzing recently with news about a tameable Worgen. If you haven't been paying attention, in short, Garwal (a quest NPC that starts as a wolf, but turns into a Worgen) could be tamed as a Worgen if you get your timing right, and then you'd have a very unusual pet following you around.
Note that I say "could be tamed," not "can": apparently Blizzard has hotfixed the NPC so that he can no longer be tamed, stating that they never intended players to have a humanoid pet. Players who have already tamed Garwal will find that they have no talents or abilities for him, nor can they feed or buff him rendering him effectively useless except as a vanity pet. I would expect him to be removed even as a vanity pet soon.