With Patch 10.1.5, Blizzard seems to be preparing to enable Dragonriding to be used in the Old World with the new Flight Styles mechanic and more mounts receiving Dragonriding animations.
Flight Styles in Patch 10.1There are two new spells related to flying in Patch 10.1.5: Flight Style: Static and Flight Style: Dynamic. There seems to be a system coming along that will allow the player to choose if they want to keep the old flying or dragonriding as their flight method. Old flying is referred to as «Static Flight» while Dragonriding is referred to as «Dynamic Flying».
Dragonriding in Kalimdor and Eastern KingdomsPatch 10.1.5 adds many new dragonriding race achievements to Kalimdor and Eastern Kingdoms, meaning you will be able to use it on those continents.
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