I have watched it over and over and I am convinced that the bonnet has been doctored, especially if you look at the nostril grill. I know that HSV has always filled this in across the top but if you look carefully, this strip does not match the bonnet properly. I think that the high butterfly Pontiac shape may appear here.
Also I happened to run into someone involved on the line last week, (I know my mates cousins brothers cleaner etc.) and he seems to be in a position to tell me that all of the lower spec HSV cars up to GTS will get the Pontiac bonnet. It appears that Senator and Grange will not.