Schema changes for adding a Server 2012 Domain Controller on an exsiting forest/domain functional level with Server 2008

Hi all,

I am researching for what schema changes if we add a Server 2012 Full DC/RODC on an existing Forest/Domain functional level with Server 2008 environment.

We have multiple DCs in our environment with Server 2008 OS now, and would like to know what schema changes so that we can review and check before running Adprep /forestprep and domainprep and raise forest/domain functional level as well.

And, anything we have to concern before we add a serve 2012 Full DC/and, or RODC beside?

Thanks,