A fully camouflaged prototype of the Audi S4 Avant has been spotted by an Instagram user.

A fully camouflaged prototype of the 2016 Audi S4 Avant has been spotted by an Instagram user.

Practical and powerful, the S4 Avant is getting ready to receive a new generation which is expected to bring an increase in size even though the model is bound to lose around 100 kg (220 lbs) thanks to the MLB Evo platform. The outgoing mode offers 490 liters of trunk space with the rear seats up and 1,430 liters once you fold them down so expect these numbers to grow a little bit as a result of the increased proportions.

Underneath the hood will likely reside an uprated version of the TFSI V6 3.0-liter from the outgoing model where it generates 333 PS (245 kW) and 400 Nm (324 lb-ft). We won’t be too surprised if Audi’s engineers will squeeze up to 360 PS (265 kW) from this engine and coupled to the weight loss it should greatly improve performances. As a reminder, the current S4 Avant sprints to 62 mph (100 km/h) in 5.1 seconds and tops out at an electronically-capped 155 mph (100 km/h).

In terms of design, the heavy amount of camouflage on the prototype doesn't show any of the body details, but previous spy photos of the sedan have shown Audi will play it safe and go for an evolutionary design which will be a bit sharper compared to today's styling.

Audi will show the regular A4 B9 this fall at the Frankfurt Motor Show so expect the S4 / S4 Avant to come out probably in the second half of next year while the range-topping RS4 won't be out sooner than 2017.

2016 Audi S4 Avant spied parked on public road