In a hotfix today, Blizzard has slightly updated the model for the Voyaging Wildering mount, the reward for completing all Dragonflight raids on Normal or higher while they are Awakened in Season 4.
Completing all raids on normal or higher while Awakened completes Awakening the Dragonflight Raids which rewards Voyaging Wilderling's Harness.
The new model adds more teal to the mount, plus changes its horns and saddle slightly.