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There are two installation options for Windows Server 8: Server Core or with a GUI. If you install a GUI you can remove it later — either all the way down to Server Core or as a new minimal UI Server.
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.