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Surely you all remember the interview Josh Hartnett gave to CQ Magazine Germany which was published in its Fall/Winter 2009 edition ???
Well at the beginning of the interview, it is mentionned that "The 31-year old is off to a movie shooting tomorrow to South Africa." Later, in the same article, Josh revealed also "the crazy story of [his] new film: Takako Konishi , a Japanese girl who is travelling from Japan to Minnesota, to find the money that Steve Buscemi was carving in the snow in 'Fargo'. She gets involved in lots of dangerous situations and finally dies. The story is true."
By a strange coincidence, I have come across the May 2009 issue of the British Cinematographer Magazine which states that cinematographer "Robert Alazraki (AFC) is off to South Africa to shoot Miles Roston's Promise Me,"
See by yourself (page 13) : British Cinematographer.pdf
Therefore my humble guess is that the production of 'Promise Me' has already begun with a 2009 shoot in South Africa. And that Josh has another film project in development about the suicide of Takako Konishi.
What is your guess ?