https://wowpedia.fandom.com/wiki/Storm_Rider
https://wowpedia.fandom.com/wiki/Storm_dragon
https://wowpedia.fandom.com/wiki/Storm_drake
So Odyn says Storm Drakes were born of the Gods, while the Storm Dragons of Skywall have unknown origins, but protodragons may have evolved from them.
Friends, it is obvious that the Algarian Stormrider is an elemental dragon that is able to traverse the Storm.
"As one storm recedes, another rises."
This means several things.
Deathwing failed but his duty to usher in the Old Gods it carried on by the Harbinger and Iridikron.
Razageth died and her storm over the Forbidden Reach dissipated, but now a new storm is on the horizon.
The Storms of Avaloren are elemental in nature, and Odyn tapped into that power long ago. That's why he has Storm Drakes.
That's why Thrall will be important, the World Shaman who can wield the storm in the palms of his hands.
The storm isn't just a thing preventing us from going to Avaloren. It is a fundamental theme of the expansion. Hence the mount.
Make no mistake, the Void is the main antagonist. But the elements will be a large part of the expansion alongside Life and Order.