Microsoft has released Windows 8 RTM for MSDN,TECHNET and volume subscribers on AUG 15 2012, as declared earlier on AUG 1st 2012 – RTM(Release to Manufacture) announcement.
Windows 8 RTM – Enterprise – x86 & x64
Windows 8 RTM – Professional (Retail and Volume)– x86 & x64
Windows 8 RTM – x86 & x64
Screen shot from MSDN
Screen shot from TECHNET
These editions are available for
Note: Windows Server 8 is not yet been available for download for MSDN/TECHNET Subscribers. Soon it will be available.