Chennai: Actor-filmmaker Kamal Haasan released "Vishwaroopam" trailer in Auro 3D surround sound on his last birthday, and if everything goes as planned, he is likely to unveil "Vishwaroopam 2" trailer on his November 7 birthday. "He has been thinking about releasing the trailer of the sequel on his birthday. It was supposed to be released earlier, but there was some more editing to be made. He is yet to confirm if he will indeed release it on his birthday," a source from the film's unit said. "Vishwaroopam 2", Tamil-Hindi bilingual spy-thriller, is written and directed by Kamal Haasan, who also plays the role of Major Wisam Ahmad Kashmiri. Veteran Bollywood actress Waheeda Rahman plays Kamal's mother in the film, which has been produced by Venu Ravichandran.