As the first part of Microsoft's effort to provide more detailed service information about the Office 365 Government Community Cloud (GCC), a new service description page has been added to Service Description pages on TechNet. At some point in the near future, we are also expecting a separate page describing the roadmap and timelines that are specific to the O365 GCC.
http://technet.microsoft.com/en-us/library/office-365-government.aspx