Madeleine McCann disappeared from her hotel room in Praia de Luz, in Portugal in 2007, while her parents were having dinner nearby.
Lawyers are "closely watching" what Amaral will say in the show about Madeleine's disappearance. They noticed that their daughter went missing at 10pm, and alerted the police which prompted a search of the resort, although the response from the Portuguese police has since been criticised for their failure to act fast enough and close the country's borders.
And it's not just the trailer that has been released, the air date has also been announced - and it's tomorrow, March 15. While it will feature interviews with investigators, journalists and friends of the McCann family, it does not feature contributions from Kate or Gerry McCann.
They are now embroiled in a bitter, long running legal battle with him over his bombshell accusations.
They include Anthony Summers and Robbyn Swan, the investigative journalists who co-wrote 2015's "Looking for Madeleine"; Gonçalo Amaral, the investigating coordinator with the Policia Judiciaria in Portugal; Robert Murat, who was once considered a suspect in the case; Jim Gamble, former head of the Child Exploitation and Online Protection Centre in the United Kingdom; and Phil Hall, the McCanns' former PR rep, Phil Hall.
People across the United Kingdom grieved the disappearance of the small girl after she vanished in May 2007.
"There's huge hope to be had with the advances in technology".
He said: "I absolutely believe that in my lifetime we will find out what has happened to Madeleine McCann". Year on year other techniques, including facial recognition, are getting better.
In a statement last week they said the Netflix film could "potentially hinder" the ongoing police investigation.
"Consequently, our views and preferences are not reflected in the programme".