Vidya Balan was completing work on the much awaited Bollywood sequel ‘Kahaani 2’ at a blitzkrieg speed till recently. But the actress, who recently left for a vacation, has to still shoot for a small part and a song of the film. Directed by Sujoy Ghosh, ‘Kahaani 2’ was to hit the screens on November 25. But it seems like the makers don’t want to rush through the post-production and hence may postpone the release to next year. Besides, if ‘Kahaani 2’ releases on November 25 then they will be clashing with Shah Rukh Khan-Alia Bhatt starrer ‘Dear Zindagi’.