Opel's popular Insignia sedan is getting a mid-cycle refresh, and having spied the camouflaged car back in April, it has now been spotted undergoing some hot weather testing in southern Europe. As the brand's best-selling car, Opel won't be making any drastic changes to the Insignia. But given that it was launched back in 2008, it's time for a spruce-up. Both the sedan and Sports Tourer wagon where spied testing, and from these snaps we can discern re-designed bumpers, headlights, grille and taillamps.