New mounts coming Patch 6.2.2 (and beyond).Patch 6.2.1 will soon introduce flying to Draenor. Meanwhile. 6.2.2 is already in testing and will introduce at least six new mounts to the database, though not all will be available immediately. Much of the source information is from data-mining and may change before release.
The stunning Heavenly Azure Cloud Serpent is the reward for the next mount collection achievement, Lord of the Reins. It requires you to have 300 mounts on a single character (usually excluding class mounts).
At least two mounts will be purchasable from new Timewalking vendors. These will use a new currency, Timewarped Badges, that are earned in Timewalking dungeons (on specified weekends). The purple Eclipse Dragonhawk will be sold by Cupri in Shattrath, and the ghostly blue iron horse - the Ironbound Wraithcharger will be sold by Auzin in Dalaran.
A new yeti mount, the Minion of Grumpus will be related to the Feast of Winter Veil in 2015. We're not yet sure of its source.
Our Legion Collector's Edition mount reward has been revealed! The Illidari Felstalker is based on the new Felstalker model introduced in 6.2. It will have a matching companion pet.
Armory update bug updates...
The Felfire Hawk and Voidtalon of the Dark Star are now showing up on the Armory, so you no longer have to manually add them to your collections. Unfortunately, however, the Brown Horse and Swift Warstrider seem to have vanished from the Armory around the same time and now require manual flagging (see their individual pages to add them to your collection). The Chauffeured Mechano-Hog and Acherus Deathcharger have not changed status and also remain missing.