It's no secret that BMW intends to market a whole line of advanced dedicated hybrid, range-extended and plug-in electric models under its new "i" sub-brand.
The question is, what's up next after the presentation of the i3 hatchback in 2013 and the i8 sports coupe in 2014? While BMW is keeping mum about its future plans, our spy photographers captured a strange looking 7-Series prototype, seemingly based on the standard ActiveHybrid 7.
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