Just noticed, but I think it already happened last week. Ubisoft showed with its Kinect release that the accesible and fun Just Dance 3 has more appeal by overtaking the dancing Kinect staple Dance Central 2.
http://gamrreview.vgchartz.com/game/51777/just-dance-3/
http://gamrreview.vgchartz.com/game/51391/dance-central-2/