The pictures have been published by an American blog site, but Porsche denies they are official shots, which aren’t due to be released until September.
Assuming the images are accurate, they suggest that the 911 has evolved subtly, despite every exterior panel being new.
At the front, the overall styling is similar to the current car's, with round headlights and slim indicator lamps at the top of each air intake. There’s a slightly lower, sleeker look than before, presumably in the interests of optimising airflow.
Its profile and side windows appear to be little changed, although the side mirrors are now mounted on the door, rather than at the front of the windows.
The most dramatic changes are at the rear, with much slimmer tail-lamps and a wider bootlid that allows for a larger pop-up spoiler.
New Porsche 911 gallery
Inside, the cabin mixes elements of the current 911 with newer models such as the Cayenne and Panamera.
Porsche hasn’t released any technical details of the car yet, but it’s expected to make more use of lightweight materials and have a range of more efficient six-cylinder engines.
The new 911 is expected to go on sale later this year, with first UK deliveries due in spring 2012.