While this particular mule is still heavily camouflaged, we can see additional details including a massive grille, a unique greenhouse, and a dramatically shaped rear hatch.

Saab's upcoming 2010 9-5 sedan has been spotted undergoing high altitude performance testing in the Alps.

While this particular mule is still heavily camouflaged, we can see additional details including a massive grille, a unique greenhouse, and a dramatically shaped rear hatch. If you're having a hard time picturing what the new 9-5 will look like, last month's supposedly leaked computer generated images might give you a better impression.

Despite the promising exterior design, our previous spy photos of the interior showed a somber cabin with a button-intensive center stack and a large navigation screen.

Set to ride on a sportier version of GM's new Epsilon II platform, (the base Epsilon II platform underpins the Opel Insignia and Buick LaCrosse) the 2010 9-5 will boast a 2.84 meter (111.8") wheelbase which represents an increase of 14 cm (5.5").

Engine options will likely mirror that of the current 9-3, meaning we can expect a variety of turbocharged petrol engines including a 2.0-liter four-cylinder with 210hp, a 2.8-liter V6 with 280hp, and possibly even a range topping turbocharged 3.6-liter V6 with 350hp. If petrol power isn't your thing, Saab will happily sell you a diesel engine, a unique biofuel model, or potentially even a petrol-electric hybrid.

Look for the new 9-5 to be officially unveiled at the Frankfurt Motor Show in September.

 

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2010 Saab 9-5 sedan latest spy photos in the Alps