Following the debut of the radically fresh XF sedan last year, Jaguar continues to move boldly to redefine itself in 2010. Jaguar's flagship XJ has been put on a temporary hiatus for 2010 as a new version of the luxury sedan is expected for release in 2011. Leaving only the XF and XK models to represent the 2010 Jaguar lineup, two cars are heavily revised. The main source of change comes with the introduction of the AJ-V8 Gen III engine. An almost entirely new engine, the Jaguar 5.0-liter V-8 employs direct fuel injection and is offered in naturally-aspirated as well as a supercharged variant generating up to 510 horsepower. Both versions of the new engine are available on the 2010 Jaguar XF and XK. For 2010, the Jaguar XF base model retains last year's 300-horsepower 4.2-liter V-8. Besides the new powerplant, the 2010 Jaguar XK receives the brand's new rotary gear selector. An active rear differential and more aggressive sport grille have been adopted by the 2010 Jaguar XKR.