Porsche was spotted the other day in northern Europe perfecting what will become the range-topping 718 Cayman GT4. Positioned above the recently launched GTS, the new crown jewel of the Cayman family appears to be virtually undisguised, hinting that an official reveal is right around the corner. Our money is on the Geneva Motor Show which is set to open its doors at the beginning of next month.

There are quite a few differences between the GTS and the forthcoming GT4, starting at the front where the redesigned bumper hosts enlarged air vents providing better cooling. Right below the bonnet, on the upper section of the bumper, there’s a wide slat akin to the recently revealed 911 GT3 RS.

Speaking of the higher-end GT3 models from the expansive 911 family, the naturally aspirated 4.0-litre engine is expected to trickle down onto the 718 Cayman GT4 - no turbo here. It will allegedly be detuned, but it should still pack around 400bhp. The car will likely go on a diet for an improve power to weight figure, this new iteration of the hardcore Cayman is shaping up to be faster and more agile than its predecessor.

Getting back to the prototype at hand, the rear of the car is modified beyond GTS spec. The most obvious novelty is the addition of a fixed rear wing, along with a more agressive diffuser featuring two large exhaust tips. 

We are also expecting to see a re-tuned suspension, bespoke alloy wheels, and upgraded brakes to round off the package and make the GT4 justify what will be a significant premium over the £59,866 GTS. Considering a base 911 begins at £78k, some folks will have to make a difficult decision: go with the Cayman GT4 or get a standard 911? Factor in the 718 Boxster Spyder, it will be quite tricky to pick one.

Gallery: 2019 Porsche Cayman GT4 spy photos