Secret audio recordings from the state's top crime-fighting body will be played when William Tyrrell's foster father faces a two-day hearing in Sydney later this year.
The man — who cannot be named for legal reasons — has already pleaded not guilty to two charges of knowingly giving false or misleading evidence to the NSW Crime Commission.
William Tyrrell was dressed in a Spider-Man suit when the three-year-old disappeared from his foster grandmother's home in Kendall in September 2014.
The NSW Crime Commission works alongside NSW Police to investigate serious crimes, including homicides and has the power to compel people to give evidence.
Magistrate Miranda Moody was surprised when the man's lawyer Carly Hydes requested a two-day hearing before Sydney's Downing Centre in October.
"There is a large amount of audio to be played from the interviews," Ms Hydes said.
The hearing — which has been set for October 12 and 13 — will include the 55-year-old's interview with police and other electronic material.
The man was not arrested but charged over the allegations of giving false or misleading evidence by Detective Sergeant Andrew Lonergan from the Unsolved Homicide team in January this year.
In November, Detective Sergeant Lonergan was one of a few detectives who carried out a four-week dig of bushland about a kilometre from the Benaroon Drive property where William went missing.
Karen Webb was announced as the new Police Commissioner at the same time and said she was confident of a "result" but it would "take time".
"It's been seven years now and that's a long time but we're not giving up," she said.
Commissioner Webb was sworn into the top job almost two months ago and is yet to respond to the ABC's repeated requests for an interview.
Both foster parents have also been charged with the alleged common assault of a child — who is not William Tyrrell.
They have pleaded not guilty.
Despite a $1 million reward and hundreds of persons of interest being interviewed, no one has ever been arrested or charged over the boy's disappearance.
