The next public version of Windows 8 is reportedly completed, about two weeks ahead of its planned launch to the world. Winunleaked.tk claims that Microsoft has finished work on the Windows 8 Release Preview (otherwise known as the release candidate) which will have the version number of 8400.
The post on the Winunleaked.tk forums (free registration required) supposedly has an image of the Start screen from the 8400 Release Preview build of Windows 8. The post also
claims that the SKUs that will be launched for the Release Preview include Windows 8 (Core), Windows 8 Release Preview (Pro), Windows 8 Release Preview with Media Center (ProWMC) and Windows 8 Enterprise (VL).