What evidence?
I’ve not seen the evidence in your reply to Makorus above. Just that the Dwarves themselves are known as Stormriders and not the Gryphons. But that isn’t evidence that the Algarian Stormrider isn’t a Gryphon. Is your evidence the Stirmrider Elemental from content around 15 years old? Why does that have more credence than content that’s more recent at 5 years old. What makes a Stormrider a Stormrider? We don’t know. We do have evidence that’s been datamined from the Trading Post in regards to the Stormrider’s Arsenal. Is your belief that it will deck us out to look like the below?
https://wowpedia.fandom.com/wiki/Stormrider
It’s likely the concept of Dragonriding will carry over, so it’s likely the pre order mount will have those mechanics. Can you see the above elemental not looking silly whilst using the current dragonriding abilities & mechanics?