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Hmmm...The model and renderings that I have seen did not remind me of a BMW 5 Series, other than they both have wheels, doors, windscreen, trunk, etc. These spies must have access to better information than I have!
Well it does say in the article next BMW 5 series which we don't really know what will look like exactly. Perhaps people heard it being compared to a 5 series in terms of size and seating and decided it might be based on it or similar to it. But who knows for sure, apart from CEOswife