Both cabrio and coupe prototypes spotted showing new details, including a new adjustable rear spoiler.

Here are the latest and some of the best shots yet of the next-generation 2012 Porsche 911.

Porsche has been testing prototypes of the next 911 for nearly two years now and this current set of pics reveals both cabrio and coupe prototypes wearing far less camo than we've seen before.

Of course, the 911 is staying close to its iconic shape, but these prototypes show new details, particularly at the rear with a new design line between the set of lights. There's also a new adjustable spoiler there and we can see how it is up in some of the photos.

For improved efficiency, the next-generation 911 will come with a stop/start system and regenerative braking as a standard feature.

Engines will also be upgraded, beginning with a revised 3.6 liter flat six producing 365 bhp (272 kW / 370 PS) and 400 Nm (295 lb-ft) of torque while the Carrera S variant will be fitted with an updated 3.8 liter 6-cylinder power plant featuring 415 bhp (309 kW / 421 PS) and 440 Nm (325 lb-ft) of torque. The next-generation 911 will be available with either a six-speed manual or the seven-speed PDK.

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