Google's "Fizz" is another Kabylake-based Chromebook. Support for this device was added yesterday to mainline Coreboot Git. The Chromebook Fizz is similar to the Poppy device with various internal differences. Fizz isn't libre but as with all recent generations of Intel hardware, will continue to rely upon proprietary blobs for the firmware support package, etc. But at least it's nice seeing Coreboot used by Chromebooks still and with the latest-generation Kabylake CPUs.
Those wishing to explore it more can find all the Coreboot Fizz code via the Git repository.