Building Windows 8 (Steven Sinofsky Blog) - http://blogs.msdn.com/b/b8/

The Windows Team Blog - http://windowsteamblog.com/

Windows 8 Preview Release Download - http://windows.microsoft.com/en-US/windows-8/release-preview?ocid=W_BLO_W8R_WinTeam_Blog_EN-US

Announcing the Windows 8 Editions - http://windowsteamblog.com/windows/b/bloggingwindows/archive/2012/04/16/announcing-the-windows-8-editions.aspx