The new patch comes with a new raid and dungeon, and of course one of the rewards is mounts. Let's take a closer look.
Sanctum of Domination is a new raid of Shadowlands released in patch 9.1 Chains of Domination. The Raid has 10 different bosses with unique abilities and for each you need to choose a strategy to defeat. On Mythic Difficulty from the last boss, Sylvanas Windrunner, you can get Vengeance's Reins. And the boss The Nine have a chance to drop Sanctum Gloomcharger's Reins on all difficulties. Drop chance is pretty low, like 1-2%
Tazavesh, the Veiled Market is the new megadungeon to Shadowlands 9.1: Chains of Domination in World of Warcraft. It's a mysterious flying Bazaar, full of secrets and powerfull artefacts. There are eight bosses in this dungeon. There are several mounts that you can get through this dungeon.
Fake It 'Til You Make It - is an achievement, there you need to defeat So'leah in Tazavesh, the Veiled Market after being caught using forged credentials on Mythic Difficulty. Reward is Tazavesh Gearglider
Cartel Master's Gearglider is another glider that you can get with a small chance (1-2%) after defeating the last boss - So'leah in the Tazavesh. It can be dropped in Mythic Difficulty or Mythic Hard Mode. It drops out by personal loot, so it may happen that after defeating the boss, the mount may drop out to several players in the group.
As you remember in the first season of Shadowlands, in Torghast you was be able to get a hound, by clearing all layers in Twisting Corridors. It was difficult and took pretty much time, but in second season in Torghast was added another check - you need to achieve a Flawless run on layer 12 in each wing of Torghast, Tower of the Damned. You will earn Flawless Master achievement and mount reward - Mawsworn Charger.