Flying in the Dragonflight Expansion - Dragonriding Replaces Flying in the Dragon Isles

wowhead.com:

Blizzard has confirmed that you will only be able to «fly» in the Dragon Isles using the new Dragonriding system. Your broader mount collection will act only as ground mounts in the new zones. In an interview with AusGamers, Jeremy Feasel spoke more about the new system, including details about how it will allow you to travel faster than existing mount speeds and an idea about how the system will work in practice.

“You press the spacebar and you do a giant takeoff. And then the whole mini-game is that you've got height and speed and you have to try to figure out how to get as far as possible before you land again. And it should feel like you're swooping and diving through these landscapes.

With giant zones the two ended up working really well together. You're gonna move really fast when dragonriding too, much faster than existing mount speeds. Taking off there should be a giant gust of wind and a big flap of your wings,” Jeremy adds.

“Our environment team is doing a great job incorporating things like more cloud layers so that you can fly through clouds and get that feeling of moving really fast. And then as you start to speed up and go faster and faster you'll see particles fly off your wings. And eventually that turns into contrails.” “A big push was to make the experience of moving around the world feel more three dimensional,” Jeremy continues.