For some time we know that the release of Windows Phone Tango will with it new functionality to the Microsoft platform, but until now the details about it were rather scarce. There was only an impression, not entirely confirmed, that Tango was the operating system of choice for mobile Windows Phone low end, adapting perfectly to a much slower than hardware.
Jaxbot from Windows Phone Hacker has managed to get my hands on Build 8731 of Windows Phone Tango and has made a video that outlines the new features of the upgrade, including the new location of the icon in the status bar changes to level interface for MMS and much more.
The author of the video has released an unlocked version of the build, but for more information please refers to the source.