Hands-on: Windows 8 beta (c|net - Asia)
A killer feature that is missing would be facial recognition logins. The better of these apps have been proven to be resistant to printed photo hacking, and it would extremely useful to have a Webcam recognize your face and log you in without having to physically touch the computer. At least nobody else has this integrated into the operating system yet, but since third parties like KeyLemon and FastAccess have been working on their versions for a while, expect it to arrive in the big players sooner rather than later.
You can download the Windows 8 Consumer Preview for free
here.