According to the report that was published with the photo, the image was found on a microSD card and appears to show a notifications center and a unified messaging inbox for Skype and messenger. Considering that the image was found on a random microSD Card, there is no chain of evidence to prove anything.
What is going on here? Major updates found on Craig's List and a microSD card showing the next build of Windows Phone? If we didn't know better, the timing of these discoveries, just days before Apple unveils its new iPhone line, might also seem suspicious. What's next, a screenshot of Instagram for Windows Phone found in a box of Lucky Charms?
source: XDA via WMPoweruser