Since the announcement that Blizzard intended to bring Dragonriding to the rest of the World of Warcraft outside of the Dragon Isles, the developers have slowly been expanding the list of Dragonriding capable mounts to include several varieties of Proto-drakes, Fire Hawks, Rocs, and Wyrm mounts, such as the Battlelord's Bloodthirsty War Wyrm and Pureblood Fire Hawk!
Alongside the discovery of two new spells in Patch 10.1.5, Flight Style: Static and Flight Style: Dynamic, which appears to be the toggle with which players will control whether their mounts "swim through the air" or use dynamic flight abilities like the ones introduced in Dragonflight. Blizzard has been clear that this feature will not be ready for the live game until later in Dragonflight, but it is very nice to see more movement on this highly requested feature!
Today, the list of Dragonriding capable mounts includes 103 new mounts