Earlier this month, Microsoft announced that its Xbox 360 dashboard would be getting an upgrade "in the coming days." Today, the company has clarified that statement, declaring that the revamped interface will launch on December 6th. As we've previously noted, the update promises to bring deeper Kinect integration (including sharper voice recognition capabilities), Facebook sharing mechanisms, and a cleaner interface. Redmond also says that the fall cleanup will introduce "a wealth of new con…