I searched for more fotos of the Porsche 911 R and found the view angle of the teaser image above is quite warping. In fact the car's design is a long boat rather, the image completely obscures the real shape. – Is that the look of a driver's car? To me it looks as if it was made for fat gondolieri. I decided to reshape it (as my personal concept car – see the renderings). 
I gave the 911 R the shape the car pretends in the teaser image it has.
These are the design issues that have to be tackled:
- The philosophy of the 911 to be rear-engined is interpreted in Weissach as 'engine beyond the rear axle'. To compensate the resulting rear overhang the car front is over-jacked (with no real reason) - last image above.
- In the original 911 design the shoulder line  draws a bow with full-length body tension. It was deadly to let the line visually sag vapidly in the door segment.
- The inclined silhouette is not only prominent from the side view of the car but also from the top view (Porsche 356). For the rear wheels the track is more narrow. – Nowadays the Porsche management directs its designers to change the style to the opposite. The back view has to look fat and martial. From the side view the lines have to rise toward the back (e.g. the shape of the side windows).
Alltogether the points repudiate the foundational principles of Erwin Komenda's 356/ 901 design. (Since 1963 Porsche tries to understate Komenda's role as the origin of its car body design.)
The essentials of the 911 car design
(and the deadly sins to get something else but not a Porsche 911. It seems in Weissach they don't know about these essentials.)
1. The basic silhouette of a flat roundet cone
(and to turn it into a box)
2. The shoulder line as a bow with full-length body tension
(and to turn it into a slack wave)
3. The lines of the car follow an air-flow pattern that clings to the ground
(and to turn the lines into a “dynamic” uplift to the rear end)
4. The profile that signifies acceleration is drop-shaped declining to the rear end
(and to turn it into the opposite, a big-ass design)
Even Daimler follows these (in blue) principles.
The redesign I suggest comes of course not without drawbacks. With a mid-mounted engine there would be no room for back seats anymore. (The 911 R has no back seats anyway.) I guess my draft would fit technically the 718 Cayman's turbocharged 2.0-liter-flat-four engine. (Avoiding the Cayman's smooth look of a woman's handbag, a look of no principles in the body design at all > shoulder line.) But even the 4.0-liter-six engine of the GT3 (the engine sounds really healthy) would fit. 
But most of all you can reproach my design is just as hidebound, behind the times, as the Weissach philosophy in general is. – Yes, that's true. My draft still worships the symbol of wasting of resources, the symbol of ostentation of power and the icon of automotive individual transport.  – I think it's ok as long as it is an aesthetic exercise for the mind (for the sake of the spirit of sportiness) and cheating is not the base of all. (As it is for the Porsche SE, the majority owner of Volkswagen AG. > Dieselgate. And as it is for the Audi AG, another part of the Volkswagen Group. )
 (This article was updated 2017-08-21)
I got me a 3d model of the Porsche 911 R and tweaked its proportions. For that purpose I reactivated a cgi software on my computer I used ten years ago: MODO. (Modo 401 – even today the workflow and the rendered results of a decade old 3d software version are sheer pleasure.)
I would prefer to have on this web page only views of a design I like. But the best way to judge a form/ shape/ proportion is to have an object of comparison (the OMG Weissach 911).
 Prof. Lutz Fügener provides a striking analysis (left sketch) of the essential design ideas of the 356/ 911 Porsche. But his thesis these ideas are lasting in contemporary Porsche design -irregardless of all fad- is an industry-friendly lie (after all he earns a living from the auto industry).
 In the industry it's all about the technical details: can the rear air entrance be placed like this in conjunction with a mid-engine? Aren't wheels limited in size for cars road legal? Where is the upper brake lamp? etc. – OK, all that is not my problem.
 The management of the German auto industry ignores as always the signs of the times and deceives itself (and us).
E-cars are not the solution. Power from the electricity grid is today just as dirty as combustion engines are (not to mention how dirty the extraction of lithium, cobalt etc. for millions of E-car batteries is). — The truth is, not the days of the combustion engine are over but the days of individual transport. The days of car production for individual buyers are over. The billionaires will still drive million-dollar cars, but nearly all other people will own no car at all. They will share their rides in 8 seat vehicles route-managed by AI. There will be no cars parking in the streets anymore. All the parking lots in front of apartment blocks will be empty and a car that's not on the move will be suspect or like a waste.
 Audi sets an example how much the E-car hype is about deceiving people. Audi will equip e-cars with solar cells to improve the cruising radius. – Of course the surface of a car body collects just enough solar energy to use a power window once per hour (for sure not enough to drive the air conditioner in the sun). But that doesn't matter for the industry. They don't want solutions, they want to sell their cars further on. In PR and relation to public health the auto industry is worse than the tobacco industry.