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Metro, or at least the Metro design language, is everywhere in Server 8. You'll find it in the logon screen, with an attractive deep blue background and white text.
The UI-less Server Core is Microsoft's preferred installation for Windows Server 8. It's more secure, and doesn't have the overhead of a full GUI.
Server Manager is the heart of Windows Server 8. It's where you'll set up and manage both local and remote servers, with tools for managing groups of servers and giving you an at-a-glance view of issues and problems.