Thanks to our fast acting members we have already seen the un-camouflaged i8 from Abu Dhabi, but here our spy have caught the i8 in an environment we may have not been expecting.

What has been reported so far is that the i8 will feature a 161-horsepower, 1.5-liter, 3-cylinder turbo diesel engine mated with a hybrid synchronous motor on the front axle and full electric motor on the rear axle. The 292HP is reported to be good for a 0-60 sprint in 4.7seconds but will see an X-drive variant as well or is this simply cold weather testing from Northern Sweden?

With performance targets similar to the M3 – 0-62mph in 4.8sec and a top speed limited to 155mph - the new carbonfibre-bodied coupé won’t be BMW’s fastest production model; that accolade will rest with next year’s all-new twin-turbocharged V8-powered M5, according to Munich sources. But with combined fuel economy of over 75mpg and a CO2 emission rating of only 99g/km, it will certainly be among the company’s most frugal production cars.

No official details are yet available, but rumours suggest the engine will provide around 180bhp, the electric motors 110bhp, and with the latter’s power available from zero revs, a sub-5.0sec 0-60mph time is very plausible. Top speed is likely to be a typically Germanic 155mph (limited), while fuel economy should top 75mpg. The hybrid technology, used alongside BMW’s impressive EfficientDynamics technology, should hopefully see CO2 emissions below 100g/km, enough for free road tax in the UK.

Known as the i8, the supercar will sit at the top of BMW’s new i range, the badge under which its electric cars will be sold. Kicking things off will be the all-electric carbonfibre i3 supermini, the boxier car pictured right.

The i8 is based on the BMW Vision EfficientDynamics concept from 2009, and is incredibly close both in concept and design. Its gullwing doors and 2+2 seating apparently make production, as does the prevalence of visibility – the glass surface area is large, even the doors being see-through. The concept’s proportions were very similar to a BMW M3’s; hopefully that remains true for the i8.

More rumours suggest a regular, petrol-powered version of the supercar, perhaps to help break the i8 onto the market with less risk than making it hybrid-only. If true, that would likely be a traditionally rear-drive BMW; expect the hybrid i8 to be four-wheel drive. The Vision EfficientDynamics concept had electric motors on both front and rear axles, providing power alongside a mid-mounted turbodiesel engine.

Sales aren’t expected until 2013, when the BMW i8 supercar should cost around £150,000. With lots of development time still left, a production-ready car probably won’t be seen until 2012.