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A few hours ago, Microsoft released an communication starting that today (September 10/09/2013) , Windows 8.1, Windows 8.1 Pro and Windows Server 2012 R2 RTM builds are now available for download to the developer and IT professional communities via MSDN and TechNet subscriptions. You can download it here: http://www.msdn.com

More on Windows 2012 R2:

• What’s New in Hyper-V in Windows Server 2012 R2
  This topic describes the new and changed functionality of the Hyper-V role in Windows Server 2012 R2 Preview.
• What’s New in Hyper-V Network Virtualization in Windows Server 2012 R2
  This topic describes the new or changed features and functionality in Hyper-V Network Virtualization in Windows Server 2012 R2 Preview.
• What’s New in Hyper-V Virtual Switch in Windows Server 2012 R2
  This topic provides information about the new features in Hyper-V Virtual Switch in Windows Server 2012 R2 Preview

The Windows 8.1 RTM Enterprise edition will be available through MSDN and TechNet for businesses later this month.

More info: http://blogs.msdn.com/b/stevengu/archive/2013/09/09/download-windows-8-1-rtm-visual-studio-2013-rc-and-windows-server-2012-r2-rtm-today.aspx