A Googlebook is something "above" a Chromebook (maybe the AI featureset imposes hardware demands that Chromebooks can't service) but is still made by third parties. I suppose they're keeping Pixelbook for first-party devices.
The most interesting part to me is the "Create your own widget". I'm really interested to see bespoke UI become a first class citizen. Why _can't_ I just ask Gemini to build a widget that serves the data I want how I want it?
Building "small" UI is for the birds, just expose the API and the basics and let users tell the AI what UI they want.