A question came up on Tuesdays UK PowerShell Group session about using the Windows 2012 Active Directory module. The recording links are here
The question asked if the new Site, Subnet and Site link cmdlets would work in a legacy environment.
This morning I installed a Windows Server 2012 Release Candidate member server into my Windows 2008 R2 domain. I then installed the RSAT feature on the Windows 2012 server – this includes the Active Directory module.
The site, subnet and site link cmdlets appear to work with NO changes required to the Windows 2008 R2 domain controller. I was able to view and create sites, subnets and site links.
I haven’t tested any other scenario.