Directed by Meghna Gulzar and also starring Tabu, the film is penned by music composer-filmmaker Vishal Bhardwaj.
Konkona, 35, who is playing the lead in the film, took to Twitter to announce the release date and also shared the first poster of the movie.
"Our new film #Talvar releases 2nd October. #excite" she wrote.
The poster features, blindfolded Lady Justice with a sword in hand and court documents in the background.
"India's most controversial case reopens on 2nd October" the poster reads.
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The film has been selected for world premiere in 'Special Presentations' section at the Toronto International Film Festival that runs from September 10 to 20.
Legendary poet-lyricist and Meghna's father Gulzar has written the lyrics for the film.
The movie will be shot by Pankaj Kumar of "Haider" and "Ship Of Theseus" fame.
"Talvar", is not a first film based on the much controversial double-murder-case. "Rahasya", directed by Manish Gupta and starring Kay Kay Menon and Tisca Chopra that released earlier this year, was also based on the same murder mystery.