If you've been stalling on taming a brand new transparent ghost wolf you can give up, as the ability to tame the cool new pet has been hotfixed out of the game. Drysc tells us why:

The removal of the spirit guide has been debated within design discussions for a while now as to what impact the pet and its precedent has on the game.
The unintended nature of the taming, the undead status of the guide, appearance of the wolf in relation to the feel of the hunter class, and the complex processes of taming were all issues touched upon and discussed.

Ultimately the discussions brought us to the conclusion that this should not be a permanent addition to the pet selection available to hunters; however, those that have already tamed them should be allowed to keep them due to their efforts in obtaining one.

If you've got your eyes on one of those cool semi-transparent ghost cats in Auberdine move quickly, who knows which pet will go next.