At least the US will probably get the sedan.
Audi has already shown off the 2019 A6 Sedan and Avant, which are both powered by a 3.0-liter turbocharged V6 producing 340 horsepower. A more powerful S6 is on the way, which will bridge the gap between the base A6, and the more hardcore RS6. We've spotted the S6 Sedan testing, but now we've had the chance to see the S6 Avant running laps on the Nurburgring in Germany. The Avant will likely be mechanically identical to the Sedan, but will obviously offer greater practicality and an added cool factor with its wagon body style.
The US has always had a bad track record with receiving Audi RS cars, especially wagons. The next generation RS6 could be a surprise import to the US, but we doubt that the lesser S6 Avant would also be brought over. The S6 is expected to utilize a smaller 2.9-liter V6 with two turbochargers. Audi uses this same engine in the RS5, where it produces 444 hp. This engine is also found in the Porsche Panamera 4S, where it delivers 440 hp. The current S6 uses a 4.0-liter twin-turbo V8, which pumps out 450 hp. We expect that Audi will at least match the old car's output, and possibly outdo the BMW M550i's 456 hp figure.
The new S6 should be an incredibly quick car, but we doubt the twin-turbo V6 will sound as good as the 4.0-liter V8. We can also hope and pray that the US receives either the S6 or RS6 Avant, though we know not to get our hopes up.