This is a new skin for the Draenor wolf model. It looks awesome (my opinion) and even now many of my friends want to get it for matching their transmog.
To be able to tame this beast you will need to obtain Vial of Fel Cleansing from Fel Rangari Anaara.
After that you must use the vial on a Felbound Wolf to cleanse it and then tame it.
Fel Rangari Anaara
Location of Fel Rangari Anaara:
Spawn locations of Fel Rangari Anaara