The Hot Fix has discovered something interesting, and posted pictures of what is supposedly Outlook.Next, and it appears the interface has had an entire Metro UI overhaul.
The screenshots appear to be real, and also line up with where Microsoft is headed with Metro UI on Windows Phone, Zune, as well as in Windows 8. What is interesting about these screenshots is that the user blurred out everything, except for the email address on the account. The address shown in the image belongs to one "Jed Brown" who happens to be Microsoft Outlook Product Manger.
The user at Hot fix has posted a few confirmed screenshots of Windows 8 before it leaked and also posted images of a keygen for Windows 8 from internal Microsoft resources.