Four dimly-lit photos reveal little more than that the new model will evolve the already muscular exterior of the regular GT, but do at least suggest that an earlier Autocar rendering (the fifth picture in our gallery) was quite accurate.
The track-inspired version of the range-topping GT has been spotted on several occasions development testing in the cold climates of the Arctic Circle, as shown by the other images in our gallery.
When it eventually goes on sale, the new two-seater is expected to be a key rival to Mercedes' Stuttgart neighbour Porsche and its highly rated 911 GT3 RS. It'll be built on the same assembly line as the GT and GT S at Mercedes-Benz’s Sindelfingen factory in Germany.
The GT R is the third in a planned five-model line-up and is the most aggressive incarnation of the GT yet. Together with an upgraded engine delivering around 570bhp, it receives heavily reworked underpinnings developed as part of a homologation package for the GT3 race car unveiled at last year’s Geneva motor show.
Although AMG remains tight-lipped about production plans for the GT R, information supplied to dealers by Mercedes-Benz suggests volumes will be limited in a move that will push the price of the GT R well above the £110,500 of the GT S.
Reflecting its track focus, the GT R receives a number of functional aerodynamic upgrades aimed at improving airflow to and from the engine bay, as well as increasing the downforce acting on the front and rear axles for improved stability and cornering speeds.
The GT R has a new front bumper that features a prominent splitter element, along with an enlarged central air duct and altered secondary ducts on each side.
These are joined by a modified duct within the trailing edge of the long front wings, wider rear wings and a boot-mounted carbonfibre rear wing. In addition, there is a new rear bumper that houses a horizontal air duct to extract hot air from the rear differential, a large hexagonal-shaped central exhaust and a reworked dual-channel diffuser.
However, the most distinctive stylistic change is the adoption of what Mercedes-AMG officials describe as a new Panamericana grille originally unveiled on the track-only GT3 race car late last year.
Inspired by the grille treatment of Mercedes-Benz’s 1952 SL Panamericana race car, it features an altered shape along with 15 vertical slats among the familiar three-pointed star emblem. The effect is to give the GT R a more instantly aggressive presence than the standard GT.