I was looking over the RAF mounts and thinking how each fit into the time frame when it was released.
Wrath November 13, 2008
Released 2008 - Zevra (very vanilla, like reminded me of the Barrens - Wrath has a lot of Beasty mounts... so it fit in with the other mounts of this era)
Cata October 12, 2010
Released 2010 - X53 Rocket (felt sort of Outland like, but also fit with other mounts that had come during this time, Goblin flying mounts, Rockets from holiday events)
MoP September 25, 2012
Released 2012 - Onyx Mount (this feels like something right out of Cata. Volcanic Glass.. almost like it came from Deepholm, but matched the Mop Mount types which were more colorful)
??? - Emerald Hippogryph...
??? 2014 - This doesnt remind me of MoP at all. Nothing about this mop screams Pandaria... actually what It does remind me of is Elves. Night Elves. High Elves... And its Emerald color, the wooden mount, the dream catcher seat, the orbs look JUST like the emerald dream portals. This screams Emerald Dream... If the theme holds true this should "fit right in" with mounts of the expansion it will be active during. ... So wow... What does that mean exactly? ... coincidence? Just yet another Hippogryph mount? ...
Ill let you decide.