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Metro and WinRT may be at the heart of Windows 8 on the desktop, but they're purely adjuncts on the server. The charms and contracts are there, along with the Start Screen, but you're hardly likely to see them as you can manage much of a server from inside Server Manager or via PowerShell (or externally via RSAT and System Center).
Windows Server 2012 administrators can be given rights to work with other servers — either managing specific servers for a business function, or all the servers that have a set role. You can use the tools in Server Manager to handle all those servers, including remotely installing applications and features.
A good way to start thinking about private clouds is to consolidate your storage. Windows Server 2012's Storage Pool tools can mix different types of storage and different sizes of disks into managed storage pools; these can be thin-provisioned and used with multiple copies of files and the new ReFS resilient file system for increased security.