The actor-producer, who promises some never-seen-before action with the movie, has trained hard for the Aikido, Hapkido and Krav Maga forms of martial arts that are featured in the actioner.
The makers as well as the actors have mentioned the fact that the film has more depth it than what meets the eye from the promos and the trailers.
The trailer of the Imtiaz Ali directorial will be launched on September 22 and, if sources are to be believed, the huge fan following of the 'couple' have expressed their wish to attend the trailer launch.
The documentary, the shooting for which begins on Thursday, will be directed by Tigmanshu Dhulia.
"Hogaya Dimaagh Ka Dahi", an upcoming film starring character actor and comedian Kader Khan in his comeback role, is a clean and original comedy, says director Fauzia Arshi, who regrets not being able to shoot the movie in the Taj city.
Megastar Amitabh Bachchan and National Award-winning actress Kangana Ranaut will be seen together for the first time, in an ad film.