Sujoy Ghosh said he was upset after Vidya Balan initially rejected the script of Kahaani 2 he concentrated on other projects but things patched up with Vidya and they returned with a new kahaani
The promo shows Vidya Sinha going into coma after an accident. Inderjeet Singh aka Arjun Rampal, who is investigating the case hit-and-run case, comes across Vidya's another identity-Durga Rani Singh, a criminal on the run wanted for kidnapping and murder
Vidya attended the trailer launch dressed as her character Durga Rani Singh. She also revealed that she likes to promote the film in character
"When we set out to make this film, we made a very conscious decision not to have anything attached to Kahaani. We made a separate story; it has to be completely independent. We are going to be compared so rather not attach any spill over from Kahaani," said Sujoy Ghosh