IMDb listed an unlikely 2009 release for this film and indicated under trivia that it “is based on director Alfonso Cuarón’s own family experiences living in México in 1971 (he was 10 at that time),” although this has not been confirmed.
We do know, however – from Spanish-language press covering the Copyright Summit in Brussels at the end of May 2007, where Cuarón introduced the debate: “Can creators and technology/service providers find a common ground?” – a few things: Speaking to Mexican El Siglo de Torreón, he said, “My next film is going to be in Mexico,” clarifying rumours of a collaborative project in Spain with Guillermo del Toro and Alejandro González Iñárritu, but on hold due to busy schedules, although it would be made in the context of their new $100 million company Cha Cha Cha (founded by “los tres amigos”). Spanish actress Maribel Verdú (Y tu mamá también) is attached to the project, according to Argentian Río Negro. The film will have a Mexican theme and will be a drama. It will “almost certainly” be shot digitally (a first for the director). Since the Copyright Summit, the first new news of the project came from Carlos Cuarón, who told Excelsior that it will be a family melodrama taking place in London. Earlier, it looked like the film would be set in Mexico, using Spanish (as indicated by IMDb), but an interview from 2007 indicates that of the five films Cha Cha Cha is contracted to produce with Universal, two will be in Spanish and three will feature English. Carlos Cuarón’s Rudo y Cursi was the joint venture’s first release, while Alejandro González Iñárritu’s Barcelona-set Biutiful is already in production. The first English-language release will be Rodrigo García’s Mother and Child, leaving Alfonso Cuarón and Guillermo del Toro each an English-language release of their own.
Summer 2009 update: The IMDb page for this film no longer exists and it may well be the case that Cuarón has struck it from his busy schedule. As of this update, the IMDb page for del Toro’s “Untitled Project” has also been deleted. Nevertheless, Cha Cha Cha is still contracted to produce two more films in its agreement with Universal.