User blog comment:Jackboog21/Just Dance China/Just Dance 2015 China/@comment-25225577-20150522221154/@comment-25225577-20150522225137

I highly doubt that Ubisoft will ever mention this, since distribution rights have been presumably handed over to Microsoft, and that includes marketing. Keep in mind Ubisoft has also never mentioned the existence of any of the Japanese games.

The sites I'm pulling up seem to be reporting from an official Xbox One event, so even though there's no word from our friends at Ubi, my judgement says this is totally legitimate.