The car caught in the spyshots here boasts larger wheels than the regular A7, with the back of the car revealing double exhausts on each side of the car. Yet, as you know, the main differences between an A and an S can be found underneath the hood.
According to the limited information available, the S7 will come packing an engine a bit less powerful than the one expected to be fitted on the RS. Some sources point to the use of the carmaker's new supercharged 3.0l V6, or possibly the 4.2l V8. To give you an idea on the output for the S engine, the RS7 version is expected to feature a 580 horsepower V10.
As we already told you, the Audi A7 is expected to be unveiled either at the Moscow Auto Show or the Paris Auto Show this year. Yet, with both the S and RS versions under development, the Paris show is a more likely destination for the new 7 line.
As for the A7, a quick reminder of what it is expected to bring in terms of engines. The range will likely include a 3.0l V6 gasoline (268 horsepower) and a 4.2l V8 (372 horsepower). On the diesel side, the A7 will use a 3.0l (250 horsepower) and a 4.2l V8 (350 horsepower).