Ranbir will play a superhero in the yet-untitled project, making him the next actor after Hrithik Roshan and Shah Rukh Khan to essay character with superpowers on celluloid.
"It is not like Krrish 3, it is something very different, it is going to be a fantasy film. It is going to be a trilogy which Ayan has just started writing. We share a great personal and professional relation," Ranbir told.
"Till now we are in developing stage, he is going abroad for a post production course. Hopefully, we will try and make something path-breaking," he said.
This would be the third film of Ranbir and Ayan after Wake Up Sid and Yeh Jawaani Hai Deewani. Both the films were hit at the box office.
Ranbir is also looking to explore himself by playing different roles in films.
"My next film is titled Bombay Velvet. I am playing a boxer in the film. Then I am working on Imtiaz Ali's film and Ayan Mukherjee's superhero film. I will start this film by end of next year. I am trying to do different characters, like in Besharam I played a vulgar, road type tapori character," Ranbir said.
He also expressed his desire to do an action movie, which is the current flavour of Bollywood.
"Since six years I have been trying to make my body but it is not happening. I can't do a full fledged action film till I don't have the body. But I do feel action comes from intensity in your eyes and the way you work for it," he added.