After revealing the new 2020 Porsche 911 Turbo earlier this year, Porsche is preparing to expand the 992-generation with the all-new track-focused 911 GT3. But it appears Porsche isn't done with the new 911 Turbo quite yet. Our spies have caught Porsche testing a new mysterious 911 Turbo prototype lapping the Nurburgring with a prominent ducktail spoiler replacing the standard car's active rear spoiler.

What exactly is Porsche cooking up here? Potentially, Porsche could be developing a new special-edition 911 Turbo with a ducktail spoiler, or the new spoiler could be sold as an optional accessory for all 911 Turbo models.

Alternatively, we could be looking at a new Porsche GT car with a 911 Turbo body. A few weeks ago, the Petersen Museum partnered with Bring a Trailer to advertise a build slot for a mysterious new Porsche GT car that will debut in January 2021. The car was teased under a cover sporting the signature 911 silhouette featuring air inlets in the rear fenders that are commonly found on 911 Turbo models, so the mystery car isn't the new 911 GTS.

Crucially, the car hiding under the sheets doesn't have a massive rear wing, which rules out the new GT3. Our source notes that it also isn't a GT3 Touring since it doesn't have air inlets in the rear fenders.

If this is a new version of the 911 Turbo, it looks like a lightweight special as the rear seats have been removed from the prototype. There are also GT3 RS bucket seats, but it isn't clear if they will be offered in the production model. It could even have a manual gearbox from the GT3 and only be offered with rear-wheel drive.

As standard, the Porsche 911 Turbo produces up to 640 horsepower and 590 lb-ft of torque from a 3.8-liter twin-turbo six-cylinder boxer engine, but the special-edition variant could get a power boost. This mystery will be solved in the new year when the covers come off Porsche's new GT car.