A new addition to the PvP mount family is the Vicious War Fox. The mount can be purchased for 1 Vicious Saddle in Orgrimmar or Stormwind.
Alliance players can purchase Vicious War Fox from Necrolord Sipe in Stormwind City for 1 Vicious Saddle.
Horde players can purchase Vicious War Fox from Deathguard Netharian in Orgrimmar for 1 Vicious Saddle.
Also, Shackled Ur'zul received a new color tint ever since we looked at Patch 7.3 mounts. The mount will be a 100% drop from Mythic Argus the Unmaker until next expansion.
The 100% drop chance of Mythic mounts is always drastically reduced when a new expansion's released and the raid becomes trivial.