Legion added a beautiful fox mount called the Reins of the Llothien Prowler, which requires a bit of luck as also a quest chain. In order to start the quest, you need to find an item called Torn Invitation. This item can be dropped from any of the Emissary Caches, which you get each time you complete an Emissary Quest. The drop chance is still not known/verified, but it is pretty low. Some people claim it can only drop from certain Emissary quests, but it most likely drops from all of them.
The invitation can also be awarded from the chest at the end of the Withered Training scenario. The final score of the scenario does not affect the drop chance of the invitation, so if you are already exalted, just go in there and end it to get a chest and the chance to get the invitation.
It's not really possible to farm the invitation, since you can only complete one Emissary quest each day. You get these quests automatically once you move into the active zone, which can be seen on the world map.
Once you have the invitation, click on it to start the quest. This will let you send champions from your class hall, and each quest takes about 12 hours to complete, for a total of around 3 days. This leads to a new quest where you have to go to Feathermane Hunting Grounds in Suramar and interrupt a Fox Hunt. It can be somewhat difficult to find the fox hunt, but running around for a while usually leads to finding it. Once the event start, kill the fox hunters and click on the fox to get your mount!