Actor Sanjay Dutt, who walked a free man 23 years after his legal problems began over his possessing an assault rifle, says he has not yet heard the script of a biopic on his life -- to be made by director Rajkumar Hirani.At the Fbb Femina Miss India finale red carpet, when Sanjay was asked about the film, he said: "Me and Rajkumar Hirani sir will make the film together. It will be a collaborative film from both of our productions houses. I have not heard the script yet, but I hope it will be a good one."Sanjay and Salman Khan are known to be great friends and they have worked together in many films like "Saajan", "Dus" and "Chal Mere Bhai". They have even hosted one season of "Bigg Boss" together.Regarding rumours around Salman39s cameo in his biopic, Sanjay said: "I dont know about this as I have not heard the script. But I would definitely love to have Salman in a cameo."Sanjay also revealed about his forthcoming ventures and their order of release, he said: "First, I will be doing Siddharth Anand39s film and then it will be Vidhu Vinod Chopra39s film. Since the biopic is also happening, so the 39Munnabhai39 film will happen only after the biopic."