Just two days after the final beta build of Chrome 66 was released to the Chrome OS Beta Channel, that final build has now made its way to the Chrome OS Stable Channel as the official build. The build is the same as the final beta, 66.0.3359.137 (Platform version: 10452.74.0) and it is available for most machines. As is often the case with the first build in the Stable Channel, this build is not available for devices that are running Android apps. There will be a second build, likely next week, which will be available for those Chromebooks.
My Pixelbook remains at Chrome 65 this morning as an example.
While there are a few new features in this new build, the focus is on improvements of existing features. There is also a focus on security, as you would expect, with patches for the Meltdown and Spectre vulnerabilities in this build too.