With the excitement of the new Jag XFR, the 2010 Jaguar XK has been unveiled and the new generation of the XK Coupe and Convertible get revised exterior styling and performance upgrades.Just like the XFR, the XK gets a new heart. Both, the 2010 XK Portfolio and the Supercharged XKR are powered by the all-new 5.0L V8 engine. The engine delivers a significant power increase while keeping fuel-efficiency at the level of the current XK models. The engine allows for 385hp with a maximum torque of 380lb-ft on the XK Portfolio allowing it to go from 0 to 60mph in 5.2 seconds. The XKR gets a supercharged version of the that engine, which produces a total of 510hp and a peak torque of 461lb-ft. The 0 to 60mph sprint on the XKR comes in just 4.6 seconds. Both models have an electronically-limited top speed of 155 mph.The XK Portfolio and the XKR transfer all that power to the rear-wheels via Jaguar’s 6-speed ZF transmission with wheel-mounted paddles or full automatic mode via the JaguarDrive SelectorTM.Styling revisions on the 2010 Jaguar XK Portfolio and the 2010 XKR include a new front bumper, new side mirrors with integrated LED side repeater, rear bumper spoiler, rear LED lights and color-coded side power vents for both coupe and convertible versions. The 19-inch 10-V-Spoke Caravela wheels are now standard on the XK Portfolio while the 19-inch 10-spoke Tamana wheels are now standard on the XKR. 20-inch wheels are available as options on both models.As for the interior, there are some minor enhancements. The traditional gear-stick has been replaced by the JaguarDrive "pop-up" gear selector. A 7-inch navigation and multimedia tocuhscreen comes standard on all models.There won't be any changes for prices. Which means, the new XK Portfolio and XKR will come head-to-head with BMW's 6-series and M6, Mecedes SL-Class and SL63 AMG.