If you can't beat 'em, manage 'em. That's the apparent philosophy behind Microsoft's partnership with Samsung to offer Active Directory support in Samsung's KNOX managed Android platform.
Given that Samsung wants KNOX to be an Android platform without the security worries associated with conventional "open" Android, it makes sense to integrate it with Active Directory. KNOX devices can also be managed by Windows Intune.
That said, we won't be seeing it in use for a while; the announcement says support will be added "in the coming months", but doesn't give a more specific timeframe. Given that KNOX itself was delayed and only made a belated appearance in late 2013, perhaps that isn't such a pressing issue though.