It's not uncommon to see test mules like this that use existing bodies with new hardware underneath to evaluate new stuff. It looks like this mule has both a wider track and shorter wheelbase than the Golf, which could correspond to testing chassis bits for the BlueSport. It's not clear from this batch of photos whether this vehicle has the engine mounted up front or behind the front seats. There aren't any visible ducts or air intakes feeding a mid-engine but that doesn't necessarily mean anything. Only time will tell if we get this high-mileage diesel-powered sports car.
[Source: World Car Fans]