[Samba] raising domain and forest levels

[Bob of Donelson Trophy]

I am seeing domain and forest levels for 2012R2 mentioned in the wiki
pages. 

Has anyone in a production environment "raised" their domain and forest
levels to 2012R2 yet? 

Am I correct that this would only apply to v4.5.0 or higher?

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Bob Wooden of Donelson Trophy