We've already seen prototypes of the new Audi A3 being tested to battle the Mercedes-Benz A-Class, and now our spies have spotted the new Audi S3 being put through its paces. Unlike the A3 spotted last November, the S3 prototype is heavily disguised in camouflage, but we can still see some of the styling changes such as the wider grille and reshaped intakes.

The quad exhaust pipes also confirm we're looking at a new Audi S3 prototype, although the prototype undergoing testing is the Sportback variant that won't be sold in the US.

While the exterior doesn't look dramatically different, the same can't be said for the revamped interior. Our spies managed to get some new revealing shots of the cabin, which has been upgraded with a new touchscreen display integrated into the center console and more premium materials. There's also a digital instrument cluster and the dual-switch gearbox has also been updated with a new selector replacing the old stick.

Engine options for the new Audi S3 are still unknown, but the new A3 will ride on an updated version of Volkswagen's MQB architecture. This platform supports hybrid and plug-in hybrid drivetrains, so electrified options could be added to the lineup.

Powering the current Audi S3 is a 2.0-liter turbocharged four-cylinder producing 288 horsepower and 280 lb-ft of torque, which is sent to all four wheels through a seven-speed automatic transmission. This enables the sports sedan to accelerate from 0-62 mph in 4.6 seconds before reaching an electronically limited top speed of 155 mph. The new S3 is also expected to gain a power boost to around 300-320 hp.

The new Audi A3 hatchback is expected to debut at the 2020 Geneva Motor Show in March, but US customers will have to wait for the sedan variant to be revealed. This means the more powerful S3 variant probably won't break cover until later this year. A new hardcore RS3 variant will also join the lineup at a later date.