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The Windows beta mascot, the Betta Fish, is as much part of Windows Server 8 as it is the desktop version.
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.