I'm very curious to see whether they will use the Metro UI in their server OSes. My bet is, they won't, or if they do they'll either put out a new edition fairly quickly, or will roll it back even faster to the traditional UI.
"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)."
