We still have not heard from Audi yet but there were reports claiming that the upcoming Audi RS7 Sportback might come with a 700hp engine.
This came after Marc Lichte hinted that the Audi RS7 Sportback might come with two tuned option. The lower range model will come running on a 4.0 liter twin-turbo V8 engine that will be offering about 650hp and 600lb ft of torque. The engine will be mated to an eight-speed auto transmission and should be able to hit the 60mph mark from a standstill in less than four seconds.
Then there is the RS7 plug-in Hybrid model which is said to be powered by the 4.0-liter V8 engine which will deliver about 550hp. The engine will be paired with an electric motor and that would help push it over the 700hp mark.
Of course, this is just a rumor right now so it is best to take it in with a pinch of salt for now.