Have new things been datamined, or are you talking about the plane mount?
That's far from the first mechanical mount, and even if you could draw some concrete connection to a Tinker profession instead of "crafted by Engineers for Explorers", may I remind you of the Pandaren Monk pet, released at a time when Blizzard likely had already decided to do Mists of Pandaria after the upcoming Cataclysm?