It's supported, based on this
"Support for Active Directory 2012 has been added to the management agent for Active Directory Domain Services."
"We only document support for major releases, e.g. "SQL Server 2012", and minor releases, e.g. "SQL Server 2008 R2". Service Packs are implicitly supported and you are free to apply a service pack at your own will. Service Packs should always be applied within 1 year of release."
Thanks for your reply. Upon reading the post in your link, I disagree with your assertion that it is supported. I believe if the AD MA supported Active Directory 2012 R2 it would specifically list it as it is considered a minor release and not a service pack. I agree service packs would be supported. You do provide an answer to my question however, so thank you.