Yes, but that's the Dwarf rider themselves, not the gryphon they ride on.
Because one (the achievements and trading post gear) is for 10.2 and the other (the mount) is for the next expansion which is quite possibly completely unrelated to each other.We know the mount is called the Algarian Stormrider. We know that the trading post items are also named with Stormrider present. Isn’t it far more likely that they will be linked to the mount and Dwarven Stormrider NPC in Stormsong Valley, instead of decking us out to look like a Stormrider elemental from 15 years prior that Blizzard have likely forgotten about. Unless you’re suggesting the Stormrider gear in the Trading Post is themed around Dwarves but isn’t themed around the expansion mount if it is infact the Stormrider elemental in Northrend - but then why on earth would they have two completely separate, unrelated things in game with the exact same name and released around the same time as each other?
Whether it looks silly or not via dynamic flying isn't really an issue, because that probably won't be implemented until next expansion anyway. The goal of heroic pre-purchase editions is to entice players to buy the next expansion with a few goodies attached, so Blizzard's only goal here would be to make a cool looking mount. Now, if that transmog gear was included with the heroic edition purchase, there would be no argument from me, because clearly Blizzard's goal would be to have the player be some storm riding dwarf on back of a gryphon. However, the fact that its in the trading post makes me skeptical that it has anything to do with the heroic pre-purchase mount at all.Yeah, it’s likely we’re going to get dynamic flying for all mounts eventually. It’s also pretty much accepted that it’s going to look silly on some mounts. Do you really think the new shiny expansion pre-order mount is going to use a rig that looks completely stupid when utilising dynamic flying? Especially when it might have a focal role in some of the upcoming expansion content? Be real here. It will very much be an issue if we’re given a brand new mount that we’ve paid ti pre-order that looks completely ridiculous when dynamically flying.
Again, if Blizzard is entering new territory here and integrating the heroic pre-purchase mount into previous expansion content on a level never seen before, so be it.