The discounts will come down to demand next year, based on what dealers want to give off a car. Holden just lowered the factory bonuses this month on pretty much every VF, except for the SV6 Black edition. There used to be an additional bonus for Automatic's and most other VF's, this has now ceased, which is reflected in the Build and Price part of Holden.com.au (the base bonus is now only $1,000 on manual and auto). There was also a substantial $7,000 bonus of Caprice-V which has now been cut to $3,500.
As of next year I believe there will be no factory bonuses on any VF's and they'll probably restrict demo claims on them as well. A lot of the time dealers were holding deals until the end of the month and then putting it through and claiming an end of month "no hold no count" demo bonus (which a customer never knew about). This all ceased as of 31/10/2016 because of the huge number of demo vehicles in dealer stock and as of yesterday dealers can no longer register any Commodores for the rest of the year and claim any type of demo bonus. Only really old stock (6 months+) or new models (MY17 Astra, Colorado etc) can be registered as demo's now and attract a demo bonus.
It's going to be interesting times ahead! There's rumours of massive cost cutting start next year in the marketing area.