Windows 2012 Server -- "Active Directory domains" ?

What are some good "Windows 2012 Server
Active Directory domains" step-by-step
setup websites since it looks like in the
NEW Active Directory domains, the concept
of primary and secondary domain controller
relationships no longer applies ?
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Current Setup
      ** two locations using site-to-site VPN
      ** old 2003 "Domain Controllers"
      ** want to move to "Windows 2012 Server"

   1. primary domain controller (PDC: 192.168.10.1) at site #1
   2. backup domain controller (BDC: 192.168.20.1) at site #2
   3. replication between controllers
       ** site #1 client DNS
            ** primary DNS = 192.168.10.1
            ** secondary DNS = 192.168.20.1
       ** site #2 client DNS
            ** primary DNS = 192.168.20.1
            ** secondary DNS = 192.168.10.1
   4. if either controller goes down, users can
      still login/etc using the other controller