As you my know there is already a Quilen moutn in MoP ,so this is the second time that we meet this asian lion(as I call it ).
Quilen are going to be exotic mounts-this means that you have to be at least 69 lvl and you also have to be a BM hunter.
Quilen are Ferocity pets and as exotic they have two abilities-Fearless Roar and Eternal Guardian .
Fearless Roar-The quilen lets out a fearless roar, increasing the critical strike chance of all party and raid members by 5% for 2 min.
Eternal Guardian-Returns the spirit to the body, restoring a dead target to life with 20% health and 0% mana.
As you can see those two abilities make the Quilen very useful pet in raids and dungeons.For me Eternal Guardian is more important spell because if you use it in the right time you can resurrect dead tank or healer and save the whole raid.
The Quilens diet includes fish and meat.