Only Vidya Balan and the Kolkata setting have been retained in the upcoming sequel of 'Kahaani' (2012) that rolls next month.

Buzz is that director Sujoy Ghosh is looking at a fresh cast and will not repeat anyone from the first outing. This means Nawazuddin Siddiqui, who shot to fame with the film, will be missing in action.

What will also be sorely missed is the popular character of the assassin, Bob Biswas, played by Bengali actor Saswata Chatterjee, and his trademark line, `Nomoshkar...ek minute,` before he whips out his gun and kills the victim.