Production is now underway on Mariah Carey’s All I Want for Christmas is You, a fun, and heartwarming holiday story brought to life in beautifully realized CGI animation. Based on one of the best-selling and most beloved Christmas songs of all time and the children’s book it inspired, the film which features Mariah Carey’s iconic song All I Want for Christmas is You, will be released on Blu-ray™, DVD, Digital HD and On Demand this holiday season from Universal 1440…