I know we're still waiting for The Word to come down from Pontiac, but I have seen several of these around central Ohio. I can be fairly certain that there are at least fifteen in Columbus(parked in different driveways so fairly certain not the same car multiple times).
I'd say it was probably a Pontiac produced/dealer installed packeage. That wouldn't show up on the factory option sheet, but it would account for the nationwide sightings.
Chrysler did a lot of that kind of thing with the LeBaron and the Prowler.