Rafael Rivera and Paul Thurrott have revealed the Windows 8 logon screen for this shell, which GeekSmack confirmed as real despite some misinformed rants about this being an April Fool's day joke.
The image shows the current state of the Windows 8 login screen. The overall look and feel has the Metro design language which is expected to be carried throughout the entire Windows 8 platform.
The screen carries over from the WP7 platform a look and feel that while new, is consistent with Microsoft's current product WP7.
Be it real or April 1st prank, the image is quite funny, featuring an alien like dummy: