The only mount that we can sure about so far is Skyscale. Have anybody here on forum information about other mount will be available while playing in SoTO or that we can use Gliding those times our mount is getting too wounded to survive and we need to get off our mount and use Gliding to get down to ground?
Guild Wars 2: End of Dragons guide how to get with using only Springer and Slicer (no Jacal and flying mounts): - Source of the Springs Hero Point- Seitung PUnless the player is within 50 miles of a jumping puzzle in which case the Fun Police will shut that down immediately. God forbid somebody use a mount instead of a Mesmer to skip most of a jumping puzzle and get one blue item, a fine crest and some random trash item that you can sell to a vendor for 12 copper.
War Eternal: Skyscale Flight — Help your skyscale get accustomed to flying with you, and help Gorrik investigate various tears in reality that have appeared in the air across Tyria. Find Flying Lesson nodes near the tears to call your skyscale to you.
But I see it as the likely outcome - because by introducing a new, more fun flying system, they wouldn't just throw all old mounts in the bin and get rid of all those ready made assets in favour of making lots of new "dragonflying-style" mounts from scratch, when surely it'd be easier to adapt old mounts, rig by rig..
how to get flying mount gw2
