The Independent Police Conduct Authority's long-awaited report into the Urewera raids will be made public on Wednesday.
In October 2007, police arrested 18 people in raids in several areas including Auckland, Wellington and Bay of Plenty, and of these four ultimately stood trial.
Last year the four were found guilty of firearms offences, but a jury could not decide on the main charge that they were part of an organised criminal group.
The Supreme Court in April said that it would not hear an appeal against the convictions and sentences.
That cleared the way for the Independent Police Conduct Authority to finally release its report into police handling of the raids.