With engineering still underway, the final specs for the turbocharged mill obviously haven't been published yet. However, Hyundai America's CEO previously suggested output in the neighborhood of the 420 horsepower from the company's current 5.0-liter V8. In addition, the V6 should weigh less and provide better fuel economy.
According to The Korean Car Blog, the twin-turbo V6 would likely be for an N Performance variant of the Genesis Coupe. Given the rest of the test car's label, it would presumably pair the engine with an eight-speed automatic and all-wheel drive. With 348 hp from the 3.8-liter V6 in the current model, the new mill could be quite a potent upgrade.
The next-gen Genesis Coupe is rumored to take styling inspiration from the Hyundai HND-9 Sports Coupe Concept (pictured above). While remaining a two-door, it can reportedly fit four adults more comfortably inside. Spy shots earlier this year showed one testing with the current model's body but modifications to the hood and fender arches. The engine was thought to be a V8 at the time, but perhaps this twin-turbo V6 was actually in there.