As we know that Microsoft would be releasing the Windows 8 Beta which is currently called as Windows 8 consumer preview in February



From the unofficial Windows 8 beta blog:

Microsoft started working on beta escrow builds from January 22 and the latest build compiled in beta escrow stage is build 8192 with complete string as 8192.0.winmain.120125-1820 which states that the build was compiled recently on January 25. Further it is estimated that if all goes well Microsoft would be signing the Beta build this week.

  Windows 8 latest build, build 8192 reaches beta Escrow stage