After 3 years of cool enthusiasm, Jaguar has announced some big changes for the 2010 Jaguar XKR. Actually, they’re trying to tell us that LED taillights and a new steering wheel are big changes. But, early reports like this one at Jalopnik, verify that there really is only one big change—the engine. The old supercharged 4.2L, which produced a fur-ball gagging 420 hp has been swapped for blown 5-liter cranking out 510 hp of feline fury. Expect this to be another fast cat.