Lending credence to the fact that Nokia is working on a device running Windows Phone 7.5 “Tango” is the fact that such a device has been spotted in logs for the Windows Phone application called “I’m a WP7.” The device is identified as “Champagne” and runs Windows Phone 7.10.8711 (Tango builds are believed to start at 8200).
Perhaps we will hear more about the Nokia Champagne and Windows Phone Tango at CES 2012!