There is mounting evidence that Google is working on allowing its Pixelbooks to natively support Windows 10. What's more, it seems that Google could also be chasing official certification from Microsoft meaning that the Pixelbook could even ship with Windows 10 pre-installed.
https://www.notebookcheck.net/PixelBook-could-be-in-line-for-official-Windows-10-certification.308728.0.html