Forefront Client Security SP1 adds support for:
Agent protection on Windows Server 2008 – both Server and Core.
Server role support on Windows Server 2008 (server only) for FCS server components.
FCS Enterprise Manager on Windows Server 2008 (server only).
Read more about the announcement here. Originally announced here.
Soon (not live yet as of 08-26-2008), KB 951951 will have more technical information about FCS SP1.