Our current domain is at a functional level 2008 R2 and all the current domain controllers are built on Windows Server 2008 R2 OS. One of our remote site domain controllers is up for replacement and we are looking at deploying a domain controller with Windows Server 2012 R2 OS.
Are there any "gotcha's" or things to be aware of? I understand it will likely bring the domain level up to a mixed mode but is there anything that absolutely will not work with this set up? It seems pretty straightforward with just installing the role and then running dcpromo through Server Manager. I remember how difficult the jump from 2003 functional level to 2008 R2 functional level was and just want to be sure running in this mixed mode won't cause an even bigger headache.
I have looked at Technet and not seen anything that seems too difficult or dangerous.