Microsoft Press - Free ebook: Introducing Windows Server 2012 (RTM Edition) Microsoft Press - Free ebook: Introducing Windows Server 2012 based on beta edition.
TechNet - What's New in Windows Server 2012 TechNet - Features Removed or Deprecated in Windows Server 2012 TechNet - Migrate Windows Server Update Services to Windows Server 2012
MSDN - Dev Center - Hardware > Docs > Systems > Performance > Performance Tuning Guidelines for Windows Server 2012
Microsoft Support - Windows Server 2012 update history