A thought concerning the pandaren, and where they came from.
A running theme in warcrafts lore is, as more highlighted recently though Brann Bronzebeards journals, is that the well of eternity and all associated fonts of magic have had an effect on creatures across azeroth.
Tauren are meant to have been bovine, cows and bulls, who become humanoid and thus Tauren later thanks to the well.
Night elves came from Trolls due to the magic of the well, finally cutting out a long debate on where nelves came from.
The Jinyu are meant to have come from murlocs who were close to the waters of the vale of eternal blossom, which by extent is the same waters of the well of eternity.
So it must stand to reason, if so many races are mutations of other species, some who weren't even humanoid before, that pandaren must have once been panda's who were close to the vale and become humanoid as a result.
But the question comes, much like there are still murlocs, cows and trolls still around, where are the panda's that the pandaren evolved from?