I have not heard of any rebirth of the Firebird/Trans Am. I personally think GM made a huge mistake in cutting the Camaro and Trams Am out of their lineup.
The Mustang, although always a good selling vehicle, made huge sales after GM bowed out of that field. You just don't cut a sports car out that had a great heritage like the Z-28's and Trams Am.
GM at one time owned the Police cruiser business with the older boxy Impala. They cut production of the Impala and Ford took over with the Crown Victoria. GM brought the Impala back, but it was too little - too late. Ford now owns that business and sells thousands of police cruisers and government vehicles that GM once controlled.