The lights dimmed and the crowd of men and women erupted into applause and hoots as Hollywood's blockbuster "Black Panther" premiered in Saudi Arabia's first movie theater. Though it was a private, invitation-only screening on Wednesday evening, for many Saudis it marked one of the clearest moments of change to sweep the country in decades. It's seen as part of a new era in which women will soon be allowed to drive and people in the kingdom will be able to go to concerts and fashion shows, and tuck into a bucket of popcorn in a cinema.