The official Japanese Yu-Gi-Oh! anime franchise has confirmed via Twitter that the theatrical release day of the upcoming all-new film Yu-Gi-Oh! The Dark Side of Dimensions in Japan is set for April 23, 2016, just before the Golden Week holiday period of 2016.
【劇場版遊戯王】劇場版『遊☆戯☆王 THE DARK SIDE OF DIMENSIONS』は2016年4月23日（土）公開！デュエル、スタンバイ！ #遊戯王
— アニメ「遊☆戯☆王」公式 (@yugioh_anime) November 3, 2015
We still do not have a US or Europe release date.. stay tuned as we will update you as soon as we get new information.