The report by the prosecutor who has led the investigation, State's Attorney Stephen Sedensky III, will not include the entire state police evidence file, which runs hundreds of pages, according to spokesman Mark Dupuis.
The report was initially expected over the summer, and the projected release date was pushed back several times. Sedensky has come under pressure from authorities including Gov. Dannel P. Malloy to release more information as the anniversary of the Dec. 14 massacre approaches.
Sedensky has allowed victims' relatives to review the summary report, and the superintendent of schools in Newtown advised parents to think about limiting their children's exposure to media reports Monday.
Malloy said Friday that he is frustrated the report has taken so long.
"I think all the information that is going to be made available, the sooner it's made available the better so that we can get further into the healing process for the families that have been most adversely impacted," said Malloy, who added that he had not yet seen the report himself.
The gunman, 20-year-old Adam Lanza, killed his mother at their Newtown home, fatally shot 20 first-graders and six educators at the school, and killed himself as police arrived.