I really don't see why this car isn't going to replace the Impala at the end of Pontiac's life. You can't say it was badge-engineered when the badge it came from is dead. Besides, they could take one of their closing(ed) plants and retool it for these vehicles, which would help keep the costs down. In return, GM (Chevy) gets a RWD sedan, a car that can be sold as a police unit, and doesn't lose the R&D costs, wherever they may be involved.
I also think that they should consider putting the turbo 4-cyl Ecotec in as a base level engine. Its lower center of gravity and reduced weight would still move that car around.