I have to give it to Blizz this time, what a fantastic mount!
I recently had a fly around Pandaria and found the spawn locations for each of the new Troll Zandalari scouts, we killed them and received the Slate Primordial Direhorn as a reward.
Along with large Zandalari Supplies which contained sha crystals, expensive enchanting mats and ore, and a smaller supply package that had some trillium ore in it and gold.
Also inside were the NEW 'Bind On Account' Reputation items for each of the Pandaren factions.
Check it out: