Below are the key release dates for Windows 8 and Windows Server 2012, from Developer Preview to General Availability. Where not specified, the dates apply to both Windows 8 and Windows Server 2012.
- Developer Preview Build 8102 - September 13, 2011
- Consumer Preview/Beta Build 8250 - February 29, 2012
- Release Preview/Release Candidate Build 8400 - May 31, 2012
- Release To Manufacturing (RTM) Build 9200 - August 1, 2012
- Download on MSDN and TechNet - August 15, 2012
- Download via Volume License Service Center for Windows 8 Enterprise Edition - August 16, 2012
- Download via Microsoft Partner Network - August 16, 2012
- Download access for Microsoft Action Pack Providers (MAPS) - August 20, 2012
- Ability to purchase Windows 8 for customers without Software Assurance via Microsoft Volume License Resellers - September 1, 2012
- Windows Server 2012 General Availability - September 4, 2012 (See the Windows Server blog)
- Windows 8 General Availability - October 26, 2012 (See the Windows Team blog)
- Microsoft Surface RT Availability - October 26, 2012
I've written a lot of FAQs about Windows Server 2012, Windows 8, and the latest Hyper-V info, which you can browse through at the FAQ page here.
And my colleague, Paul Thurrott, has a plethora of Windows 8 screen shots, reviews, and posts about at the SuperSite for Windows.
And also check out Active Directory expert Sean Deuby's latest articles on Windows Server 2012.