Hyundai is adopting a more assertive look for its next sedan-stunner. Spy photographers captured the new model undergoing testing in Germany.The car has already completed extensive testing in the US and is now being honed on the Nurburgring race track. Image galleryThough the new sedan is still heavily camouflaged, we can make out the shape of the new grille and see its headlights. It’s clear Hyundai is adopting a more mature look that borrows elements from the automaker’s more upmarket Genesis, which is also being redesigned.Premium touches include LEDs and dual-tip chromed exhausts. The interior will sport soft-touch materials and a large LCD situated on the center-console. VELOSTER POWER?Hyundai is sticking with the current Sonata’s platform for its next-generation flagship, though it will have undergone significant revisions. For starters, the enter engine line-up will be turbocharged. It’s possible a version of the turbocharged 1.6 four-cylinder used in the Veloster Turbo will replace the current Sonata’s 2.4 base option. The turbocharged 2.0 four-cylinder offered in the current Sonata 2.0T should carry over and we expect a hybrid version to be offered as well.Hyundai will launch its new Sonata in 2014.