I really wish they would announce the opposite, that crostini would be coming to Android and phones would launch ChromeOS "desktop mode" when attached to a monitor. ChromeOS feature flags have been seriously fun and innovative the past few years.
The Android Virtualization Framework (AVF) [0] includes crosvm support, so you can run virtually any OS you want. An Android engineer has also done a POC running ChromeOS on Android [1].
