The film will be a remake of Hollywood's 2010 comedy Knight and Day which featured Tom Cruise and Cameron Diaz in the lead.
The screenplay of the film is by Kahaani director Sujoy Ghosh and Suresh Nair who earlier wrote Singh Is King and Namaste London. The dialogues have been written by Abbas Tyrewala.
This will be Hrithik and Katrina's second film together after Zindagi Na Milegi Dobara (2011). Hrithik also has Krrish 3 out this year, and Katrina has Dhoom: 3.
Siddharth Anand's first film as director was 2005's Salaam Namaste, starring Saif Ali Khan and Preity Zinta. He later made Ta Ra Rum Pum (2007), Bachna Ae Haseeno (2008) and Anjaana Anjaani (2010).
Bang Bang is being produced by Fox Star Studios and the film will be shot at exotic locales in Europe, Far East and India.
The film is slated for a May 1, 2014 release.