Unlike the vehicle that was spotted in October 2015, this prototype is trying to evade the world's prying eyes by going almost completely incognito — not normally an accusation we'd bandy about for a bright yellow car.
As such it's missing that earlier car's honeycomb grille, more aggressive bumper and vent design, and, of course, sheets of eye-catching disguise.
Up front and around the back, this car wears the same fascias, grilles and diffusers as the already released Audi TT S. The only obvious sign that we're looking at something different are the twin oval exhaust tips hanging out the back.
Behind the car's 18-inch alloy wheels are drilled brakes fitted with RS callipers, although the RS badging has been covered over with quick spray of grey paint. The prototype seen here rides on 225/40 rubber.
On the inside, it's clear that we're not talking about a factory-ready TT as there are a rash of wires and monitoring equipment on display. The prototype is also fitted with Sparco bucket seats and a six-speed manual transmission.
In 2014, it was confirmed to CarAdvice that the next TT RS would continue with five-cylinder power. It seems entirely likely that the new TT RS will use a version of the brand's existing 2.5-litre turbocharged five-pot.
This engine cropped up most recently in the RS Q3 Performance SUV, which features the same output figures — 270kW of power and 465Nm of torque — as the version of the engine used in the RS3 Sportback.
If this variant were to be employed, the new TT RS would, on paper, at least, outgun the previous-generation's TT RS Plus, which had 265kW of power and 465Nm of torque at its disposal.
Given the weight savings brought to the latest-generation TT through the use of the Volkswagen Group's modular MQB component set, it's fair to say that the new TT RS should be lighter, faster beast than the model it replaces.
The new TT RS could debut as early as the Geneva motor show, at the end of this month, or at the Paris show in September.