Microsoft has released System Center 2012 R2 to the public via MSDN and Volume licensing. Check out the following link for more details:

http://www.microsoft.com/en-us/server-cloud/system-center/system-center-2012-r2.aspx

“System Center 2012 R2 effectively manages the scale and performance that Windows Server 2012 R2 offers.  Building on System Center 2012, this release enables at-scale management of major Windows Server 2012 R2 capabilities, including running VM snapshots, dynamic VHDX resize, and Storage Spaces.   System Center 2012 R2 also extends software-defined networking in Windows Server 2012 R2 with provisioning and management support for a multitenant VPN gateway to enable seamless extension of datacenter capacity.  System Center 2012 R2 will continue to help you provision and manage a flexible hybrid IT environment that adapts dynamically to changing business needs, including migrating workloads to Windows Azure Virtual Machines and managing them consistently.”