Another PTR build has been deployed on the public test realms for patch 3.3.3. We'll be seeing some new pets and mounts it seems. I admit I'm not as dedicated to pets or mounts as my friends are, but that doesn't mean I'm not interested in any new updates.
The Celestial Steed has been added into the game and it looks to be an all around mount that can function is a ground mount in the old world and a flying mount in Outland or Northrend. There are no screenshots of it yet, but my guess is that it's a horse with wings that could double as a constellation. Check out the picture above for an idea.