The official trailer of the Vidya Balan starrer thriller film, 'Kahaani 2- Durga Rani Singh' was released on Tuesday. A sequel to the 2012 film 'Kahaani', the film also features Arjun Rampal, who will be seen portraying the role of a police officer. Directed and produced by Sujoy Ghosh, it is scheduled to release on December 2.