The specifications sheet, which is watermarked with "Confidential" and "Draft", was published online by Axis of Oversteer.
If the sheet does prove to be accurate, the 911 GT3 RS will be offered with just one transmission: a seven-speed dual-clutch automated gearbox - known as a PDK in Porsche speak - that drives the rear wheels.
The 4.0-litre motor reportedly spins up to 8800rpm, and generates 18kW of power and 20Nm of torque more than the 3.8-litre engine used in the 911 GT3.
Compared to the 911 GT3, the RS will feature a body that's approximately 50mm wider at the front and around 30mm broader at the rear; the chunkier wheel arches house a 36mm wider track at the front end.
The RS will allegedly ride on 20-inch wheels clad in 265/35 tyres at the front and 21-inch wheels wrapped in 325/30 rubber at the rear.
Carbonfibre reinforced plastic (CFRP) will be used extensively in the 911 GT3 RS, with the material featuring throughout the interior. The front wings, luggage hatch, fixed rear wing, engine cover and front bucket seats will also be fashioned from CFRP.
Other lightweight materials get a look in as well, with the RS' roof allegedly made from titanium and the car's engorged rear arches constructed out of aluminium.
For those interested racing the GT3 RS, there's an optional Clubsport package, which includes a roll cage, six-point safety harness for the driver and a mounted fire extinguisher.
The GT3 RS will debut at the upcoming 2015 Geneva motor show in March, and was last spotted with minimal camouflage during testing in Scandinavia.