Ah, no. They've been in the files as long as the Armored Bloodwing models have been, which was 5.3. They aren't new, but I'm glad you dug them back up. I hope they get used, at least as a pet model, and maybe to be the new wyvern for undead/trolls very soon (the saddled model)
The saddle-less version would be great for a bat pet. Maybe mostly 90-95 mobs, and a few low level rare spawns too. God knows bats deserve some love after 8 years. With Kunchong, I could somewhat understand because they're a different species, even if I'm still sad that what is basically an upgrade for silithids is not tameable, it's still somewhat justifiable. Leaving hunters to tame only the old bats while we have shiny new models in the database would just be shameful, really. You can spin it any way you want, but if they did that -- just ugh.
Anyway; back when they were first revealed, someone from Scrolls of Lore actually applied the proper textures and showed them. I'll try to dig it up for you guys..
There it is! And it was Handclaw from the Scrolls of Lore forums who made it, so all credits still go to him.