Adding a Windows Server 2012 Domain Controller to a 2003 Domain

I am preparing to replace one of my Windows Server 2003 domain controllers with a new Windows Server 2012 domain controller. Are there any special considerations I need to think about before adding the domain controller?

I found some information here: http://blogs.technet.com/b/canitpro/archive/2013/05/05/step-by-step-adding-a-windows-server-2012-domain-controller-to-an-existing-windows-2003-network.aspx

It sounds pretty straight forward but I want to avoid any surprises.