"We've had a chance to play around a bit with the release preview of Windows Server 2012. Some have been put off by the interface-formerly-known-as-Metro, but with more emphasis on Server Core and the Minimal Server Interface, the UI is unlikely to be a "make it or break it" issue for most of those who are deciding whether to upgrade. More important are the big changes and new capabilities that make Server 2012 better able to handle your network's workloads and needs. That's what has many IT pros excited.
Here are 10 reasons to give serious consideration to upgrading to Server 2012 sooner rather than later."
You might want to do it for consistency if you already have Server 2008 in-house, or if in your testing you find your app doesn't migrate to Server 2012 easily or packaged apps are not available on Server 2012. But technically, Server 2012 is superior in every way.