That page has logos of Acer, Asus, Dell, HP and Lenovo. That makes me assume this won’t be a Google product, but a series of products that carry the “Googlebook” label.
If so, there likely will be some variation in the cases.
The product photos that reveal about as much as a monster in a JJ Abrams movie is because I don't think they have "Google" production hardware it sounds like they'll be farming this out to the ASUSes and HPs of the world.