BMW’s next generation flagship was spotted undergoing testing. Spy photographers captured images of the new 7 Series set to be launched late in 2015 or early 2016. The exterior looks much different from the current model and the platform underpinning the car will be heavily updated. BMW is revolutionising the way it builds its cars in an effort to converge with increasing emission regulations. Image gallery: Next BMW 7 SeriesThis means lighter construction, more fuel-efficient engines and new Efficient-Dynamics technologies such as thermo-electric devices for BMW’s future cars.Using construction techniques implemented in the development of its new i3 and i8 battery vehicles, the structure of the next 7 Series will likely incorporate a mix of materials, with carbon fibre used in addition to conventional aluminium and steel. Expect to see lightweight panels used for the roof, bonnet, and boot lid. Weight reduction should improve economy and performance.ENGINESStandard engine options will likely include six, eight and twelve-cylinder options, all with direct-injection and turbo-charging. The new BMW 7 Series will see the introduction of a plug-in hybrid model, possibly developed with technology borrowed from Toyota. For performance fans, expect a new M Performance model fitted with a twin-turbocharged V8.As for technology, expect a myriad of traffic warning systems and convenience features such as self-parking and even some autonomous driving capability. BMW has announced a partnership with automotive technology supplier Continental to further develop its autonomous car technology, which should debut on its next 7 Series.