Just got these gorgeous things in from my publisher...
I'm such a newbie that I had no idea what they are. They're folded, actually, with the complete back and front cover text. Inside the back cover is my bio, and inside the back front cover is KTeenbooks.com info.
I asked fellow KTeen author Brigid Kemmerer about them, and yes, it turns out they have a name: cover proofs.
It's weird how much cooler the cover is in the actual paper (Is it paper technically? Not quite cardboard, but thicker than paper - gah! Newbie-ness strikes!) than as just a jpeg. The lower part, where the black "grass" is in the image is shiny, and the grass as it pokes up is shiny. And the images of Dez, tiger, and moon, are all more matte. So awesome! Every step of this process makes it seem more and more real.
Oh, and the back features a quote from the lovely Brigid Kemmerer as well. She was kind enough to read it and give me a blurb