Patch 8.3, Visions of N’Zoth, will add an awesome new PvP Mount to World of Warcraft. PvP mounts are nothing new to the game, not even this model, but it does look awesome!
The Vicious White Warsaber is the Season 4 PvP mount for Battle for Azeroth. This is the Rated Arena and Rated Battleground Reward which you are probably familiar with from previous seasons.
Check out the image below, which was made by Wowhead. They also made a video with the mount in action, which you can watch here.
This mount is for Alliance players only, which you can get by getting points playing PvP games of 1400 Rating and higher. This mount requires 2400 points in total.