A matter of time, really.
But it's good news to see more enterprise-y mac management tools. Even if this stuff happens to mostly be useful to google and those shops that don't mind to update macs from google's app thingy. That's probably going to be freelance mac admins, not so much enterprises other than google themselves, for the time being. But hey, now that it's open source, the improvements that aren't dependent on google infrastructure might be merged back into munki, no?