The Delhi-set film, which will see Bachchan, 73, play a lawyer, has been produced by "Piku" director Shoojit Sircar.
The movie marks the Hindi film debut of Bengali director Aniruddha Roy Chowdhury.
Find out #WhatisPink tomorrow. He also posted the link to the 17-seconds video.
The trailer of the film will be released tomorrow. Besides Bachchan, "Pink" also stars Taapsee Pannu, Angad Bedi, Kirti Kulhari and Andrea Tariang. It will release on September 16.