It's been rumored to be in the works for some time and according to a new report from GM Authority, an official announcement regarding a new Buick Grand National and GNX is imminent. And, how about that, it'd be just in time for the Detroit Auto Show next month. Here's what we know: sources got wind of a Buick dealership in North Carolina that had a wait list up and running for those interested in test driving the Grand National and GNX.

"Customers have already started calling about test driving one of these new cars," stated the dealer owner. "We are adding their names to a waiting list." After that information got out, however, said dealer quickly issued a denial, claiming everything was a misunderstanding. Sounds to us more like an attempt at damage control before a major reveal. Both the Grand National and GNX will likely be built on GM's new Alpha RWD platform – the very same one that underpins the Cadillac ATS and the next-gen Camaro. Powertrain wise, the Grand National is expected to come with either a turbocharged 2.0-liter four or 3.6-liter V6.

The GNX is expected to have that V6, only it'd be twin-turbocharged and produce roughly 400 horsepower. Both an automatic and manual will be offered, the latter for sure on turbo models. We'll hopefully have more details throughout the month, but expect something good to happen in Detroit.