Microsoft is finally ready to release Windows 7 RTM build, but i have noticed that in backstage MSFT is also cooking Windows 8 which is in Pre-Alpha stage.
From the secret source, I have collected Screenshots and Bild tags. The build tags looks promising after having eyes to the screenshots attached below.
build tags of Windows 8 Pre-Alpha bits.
Windows 8 Pre-Alpha build 7302
Windows 8 Pre-Alpha build 7304
Windows 8 Pre-Alpha build 7308
Windows 8 Pre-Alpha build 7312
Screenshots (Confirmation of Build tags)