©Courtesy of Disney ONLY IN THEATERS DEC. 20 ACTION-PACKED NEW TRAILER FOR DISNEY’S “MUFASA: THE LION KING” PREMIERES AT D23: THE ULTIMATE DISNEY FAN EVENT  Plus, Check Out the New Teaser Poster Featuring Taka, the Cub Who Becomes Scar Disney’s Mufasa : The Lion King director Barry Jenkins and songwriter Lin-Manuel Miranda, along with cast members Aaron Pierre, Kelvin Harrison Jr., Seth…