All the comments here seem to be assuming this is a Google product, but it’s not - it’s not even a single thing.
It’s a class of laptops. Or, really, an operating system for laptops, not a new device from Google.
“We’re working with Acer, ASUS, Dell, HP, and Lenovo to make the first Googlebooks.”
So, there will be (if they all actually get released) at least five laptops that are ‘Googlebooks’.