Early draft copies of the inquiry into the SkyCity convention centre deal have gone to Prime Minister John Key and the casino, prompting speculation they are in for criticism.
There have also been questions about the visibility the outcome of the inquiry will have if it is released just before Christmas, as promised by the Office of the Auditor-General.
The inquiry was launched after a complaint from Green Party co-leader Metiria Turei over the way SkyCity was chosen to build the proposed international convention centre.
It was also intended to report on the costs and benefits of each proposal.
The deal came after Mr Key dined with the board of the casino and suggested they should pitch for the contract to build the convention centre. When SkyCity did, its bid won after it offered to pay the $350 million construction bill in return for gambling concessions which included the ability to have hundreds more pokies.