The third generation BMW X5 continues its testing trials on U.S. soil and several prototypes were spied near the Spartanburg plant in South Carolina by Palbay.

The test mules have lost some of its camouflage and are revealing more design details. The green test mule gives us a look at the M Sport package while the brown painted seems to be one of the high-end models with LED headlights. For the first time we also have the chance to see a functional air vent as seen on the new 4 Series Coupe.

Just like the new F30 3 Series, the F15 X5 will have headlights flow into the kidney grille, creating a 3D effect along with a sportier look. The front bumper will incorporate air vents as seen on some M models. The 2014 X5 will feature more flowing character lines and sculpted surfaces.

The 2014 X5 is based on the architecture of the 5 Series which provides significant contribution to weight reduction – more than 100 kilograms – despite the ever growing dimensions – along with a sportier driving experience. The lower weight also lays the groundwork for smaller engines to be used in the X5, like both petrol and diesel four-cylinder units.

Production of the F15 X5 begins in August 2013 so we expect to see the fully unveiled model sometimes in the first half of next year.

[Photos by: Palbay]