To the Chinese government he's a dissident, but to his fans around the world artist and activist Ai Weiwei is a superstar. In April, Ai was detained at the Beijing airport and charged by the Chinese government with so-called "economic crimes." He was released this week but is forbidden to talk to the press or post on social media sites. In this week's Arts File, Kerry Nolan speaks with documentary filmmaker Alison Klayman, whose forthcoming film "Ai Wei Wei: Never Sorry" will be released later this year, about what Ai had to say immediately after his release and what the future holds for the artist.