References to Google's "Eve" Kabylake device surfaced a few days ago in other Google repositories while this afternoon Eve received support in mainline Coreboot. The Coreboot commit confirms that Eve is a new board using a Kabylake CPU and the FSP 2.0 firmware support package. It's not clear if this is just a developer target or something to soon be released.
Hopefully we'll end up seeing some Kabylake Chromebooks before the holidays. Those wanting to dig through the support landing in Coreboot can find it in Git.