Adriacraft is at it again, digging through the patch 5.4.2 files and bringing you video of a new mount, discovered in the most recent patch to the PTR. It's simply named the Chimaera 2, not the snappiest moniker, I grant you, but it's just a filename for now. And, of course, it could reflect the fact that it has two heads. Could it be the Iron Chimaera mount that had concept art previewed at BlizzCon? Wouldn't it be great if the idle animation was the heads fighting?
Of course, with any new mount the question is always where will it come from? If it's the Iron Chimaera it seems very likely that it's in-game at least, rather than a microtransaction item. Maybe it'll be a rep grind, but those mounts often come in two colors, or are faction-specific. Perhaps a boss drop, then, from a raid, or maybe it's something I wish Blizzard would do more, a mount that simply has a world drop chance off rares or mobs. Like they did with the dinosaurs and the Zandalari Warbringer rares, or similar.