Hi all,
Blizzard has just released a new mount as a reward for RAF, the old one however, as already announced, has retired.
The fun thing about the mount is that you actually morph into the model itself, allowing you to carry your friend on your back (hmm) .
More info from the original post
Behold! The Recruit-A-Friend program has unleashed an all new reward mount—the swift and sleek Obsidian Nightwing. Unlike most other mounts, the Obsidian Nightwing is not a mount you summon, but rather a mount that you become, enabling you to take to the skies with a friend riding on your back. And who wouldn’t want to ride (or transform into) a winged panther?

As mentioned earlier, the previous reward mount, the X-53 Touring Rocket has now been retired from the Recruit-A-Friend program (but those who already earned the vintage rocket in the past will keep it going forward).
Other than the new Obsidian Nightwing, the Recruit-A-Friend program remains unchanged, so you can expect all the same epic benefits as before:
You Get:
A FREE Obsidian Nightwing mount for a single character - when your recruit pays for their second full month of game time
30 days of FREE game time - when your recruit upgrades to a full version of World of Warcraft: Battle Chest and pays for their first month of game time.
Your Recruit Gets:
World of Warcraft: Starter Edition, enabling them to play FREE up to level 20
You AND Your Recruit Get:
Friend-to-friend summoning, making it easy to travel and adventure together
Bonus experience when grouped together and grantable levels so you can easily maintain a character to level up with your friend.

For more details on the Recruit-A-Friend program, be sure to check out the full FAQ. Otherwise you can start recruiting now and invite a friend to join you on your adventures in Azeroth.
Finally, a short video review: