"A few days ago I confirmed that this mount, Reins of the Thundering Ruby Cloud Serpent, drops off a level 92 rare spawn called Alani the Stormborn who is located flying around the Vale of Eternal Blossoms. My video of the kill can be found here:
Mists of Pandaria Beta - Alani Killed and Looted! Confirmed as the new TLPD/Aeonaxx - YouTube . The mount drop of this rare spawn makes Alani the MoP version of the TLPD/Aeonaxx.
Alani has a buff called Nimbus Shroud which makes him immune from being attacked. This buff is removed from an item called Sky Crystal which is created by combining 10x Skyshard.
Skyshards can apparantly drop from most/all mobs in Vale of Eternal Blossoms and supposedly also from the loot bag obtained from the final quest of the dailies. The drop rate from the mobs is exceptionally low. I think my longest gap between drops was around 24 hours of grind time (over several days ofc) and shortest was about 4 hours - RNG can be a pain."