The Extra menu "Just Sweat" for calorie burning There is no longer so. According to Ubisoft can display the calories burned in the pause menu, unfortunately I can not find this feature not yet. That you burn calories with Just Dance, is safe, because the hours fly by just so, while trying to get better and to measure with other dancers who are currently online.
Otherwise, everything is as usual, except that you now get a song for matching avatar for each completed song and that in the animation sequences sometimes with real people (dancers) can be seen.
What's new is that you can link one click with three other dancers from the global community. But you can also challenge someone to dance-off, and is selected by the software "the craziest Challenger". Anyone who wants to can even record yourself on video and post it all. The other Just Dancer may own performance (incl. A good disguise, lends itself to yes) evaluate or use your video to dance. The JD Wall indicates who else is online and which competitions there.
The World Dance Floor is different now: there are well-known VIPs announced, with which you can then quasi live to dance online. The first announced artist I did not know before, but it is an "Original JD dancer" ...