I just took a closer look at the dev avatars and snaps. Those things are definitely not pants as I originally thought so that leaves dresses or skirts. The trains are definitely dresses and the animals are skirts.
I poked at the API to pull out information about the new clothes. Mmhmmmmm, unreleased clothing voyeurism.
Note that these information are likely not final. The credit price seems especially low.
Little Poundcake's Piggycorn is called "Pig Ride", which fits into the coat slot. Here's the image of it: c2.glitch.bz/clothing/2012-.... The credit cost is 25, and it's not subscriber locked. It seems like the coat overrides whatever other dress / shirt / pants / shoes you're wearing - Little Poundcake is wearing a Skeleton Bride Wedding Dress but that doesn't show up on her avatar. She's also wearing white cross-strap sandal, but the avatar is wearing a boot.
Stoot's train is called "Red Train Ride", also a coat. Image: c2.glitch.bz/clothing/2012-.... The credit cost is only 10 credit (!), and not subscriber locked. He's also wearing an unreleased shirt called "Smoky Scarpa Jacket with Shirt", which looks exactly like this released coat, but occupies the shirt slot and has a different clothing ID.
There are also a few other interesting titbits that can be gleamed from the API of the unique clothing which the developers are wearing if you guys are interested :P
I'm disappointed that they're just clothes, when I first saw them I thought they were actual animals/objects. I enjoy being half-naked most of the time :(