Yes, with the 2.3 came out, there are a new possible pet to-be tamed!
It's a summoned pet of one of the grimtotems in dustwallow marsh!
There is only one problem trough:
The ghost wolf dies in matter of seconds, as it is summoned, won't last enough to be tamed.
Solution?
Since tame beast is affected by haste spells.
Here is the important part:
-You need a metagem called "Mystical Skyfire Diamond" (Thottbot World of Warcraft: Mystical Skyfire Diamond)
-You need to spam one of the aspect spells, to make the diamond proc.
-Get a shaman with yourself, and when the proc occurs, cast bloodlust.
-If you're a troll, racial helps alot, but you need the tame spell to finish in about 30-40% of the original time (50% with diamond and 30% berserking will be enough I think)
-Enjoy your Ghostwolf pet!
Pictures:
(The original source: Mania’s Arcania: It’s all about the (WoW hunter) pets! » Patch 2.3: Ghost Wolf?)