Both models are available to order now, with Jaguar expecting first deliveries to take place in March 2014. The two special edition models will be joined in Jaguar’s 2015 Model Year XK line-up by the R-S derivative.
Jaguar has confirmed that both editions will be available in Coupe and Convertible form.
The "luxury focused" XK Signature model is priced at £54,950 and is fitted with a 380bhp 5.0-litre V8 engine, along with a host of additional features such as 20-inch alloy wheels and Reverse Park Camera.
In Coupe guise, the XK Signature can complete the benchmark sprint in 5.2 seconds, while the Convertible variant can reach 60mph from a standstill in 5.3 seconds.
The XK Signature produces 515Nm of torque, had an electronically-limited top speed of 155mph and emits 264g/km of CO2.
Priced at £69,950, the XK Dynamic R variant is "performance focused" and comes equipped with a more powerful 503bhp 5.0-litre supercharged engine. Both the XK Signature and XK Dynamic R models come fitted with a six-speed automatic gearbox.
The XK Dynamic R, which is based on the existing Jaguar XKR model, comes with a ‘Black Dynamic Pack’, incorporating XKR-S suspension and dynamics, along with a 10mm reduction in ride height.
Also included in this new XK version is a ‘Speed Pack’, which boosts the model’s top speed from 155mph to an electronically-limited 174mph. The package also includes a large rear spoiler, front splitters and a Performance Active Exhaust.
With 625Nm of torque and 503bhp on-tap, the XK Dynamic R can sprint from zero to 60mph in just 4.6 seconds. The model also emits 292g/km of CO2.
Both models are available in a range of exterior body colours, including ‘British Racing Green’, ‘Polaris White’, ‘Ultimate Black’, ‘Italian Racing Red’, ‘Dark Sapphire’ and ‘Stratus Grey’.
New XK models come equipped with luxury seats, Bright Metal sport pedals, seven-inch touchscreen, iPod and USB connectivity and sat-nav with DVD mapping.
The central seven-inch screen also projects the image from the aforementioned new Reverse Park Camera – fitted as standard to both editions.
Jaguar XK Signature models come with the choice of 20-inch Kalimnos wheels (standard) or 20-inch Takoba wheels (optional). Available for the Jaguar XK Dynamic R are 20-inch Vortex diamond turned wheels (standard) and 20-inch Vulcan Gloss Black lightweight alloys (optional).
Jaguar expects first deliveries of the new XK Signature and XK Dynamic R editions to take place in March this year.