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I'm with Tasdrouille, the trunk lid, (or more aptly "Boot Lid") is aerodynamically out of the picture, the clean separation of air at the back of the roof puts this out of any significant air currents. This roof design essentially has a KammBack designed in.
I think a KammBack is appropriate to add when a car design tries to blend the roof to the rear windscreen area with a small to medium sized radius. This causes the air to separate over a large area and creates turbulence.
Like Metro, I find the body work aft of the rear tires interesting. I tend to think that the design wants the air to try and sweep around the back as much as possible to help reduce the horizontal vortex formation in the rear of the vehicle....possibly?
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