I currently have the following setup:
Site 1 SBS2011 Domain A - 192.168.0.x - 255.255.255.0
Site 2 Win 2k8 Domain B - 192.168.25.x - 255.255.255.0
New Server Win 2012 - 198,168.25.x to be installed on Domain A - as secondary DC with DHCP
Both sites are connected via site to site VPN
i will be installing a secondary server on Domain A and removing Domain B.
End goal will be to have both servers hosting there own DHCP servers on one domain, so clients PC's can obtain there own IP's for each site. I'm sure you can have two DHCP servers as they are across different subnets with no relay agent in between. But any confirmation or ideas would be great