I tend to avoid posts like this one... I tend to focus on business problems :) But the industry has been awaiting the SharePoint 2013 Service Pack 1 to be released!
Why? No one wants to install Win Server 2008 R2 and then upgrade again to Windows Server 2012. With release of SP 2013 SP1 we can now focus on
SharePoint 2013 SP1 post:
Microsoft's SharePoint 2013 / Win Server 2012 R2 Compatibility post: