Well, not many know this yet, but the new Big Love Rocket mount from the Love is in the Air boss is actually different from the current mounts, as in it scales with the highest speed mount you have
so yeah, if you have a 150% mount, it will fly at 150%, if you have 280%, will fly at 280%, like all the scaling mounts from before (headless horseman and death knight's flyer)... but now, also 310%, which is quite surprising.
I wonder now if blizz is intending to add this functionality to all 280% mounts, so the players could choose which one to fly and not be stuck with proto drakes or frost wyrms (or a phoenix if you're lucky)
I would love this change ;D