Talk:Just Dance 2018/@comment-28748733-20171002153545/@comment-1465604-20171002232839

The preview videos are not Ubisoft just recording the routines while they run on a console. They are all mock-ups. The audio track, the video track(s), the GUI, the sound effects, everything is built together in a video editor.

So that's just them hastily using the actual song as opposed to the audio track that will be in the game.