UPDATE: So sorry folks, we don't mean to cry wolf, but upon closer inspection we believe that this prototype is actually the 3 Series GT.
With some of its rear camouflage removed, it revealed a sleeker hind roofline and rear, which gave it the appearance of a fastback/coupe-sedan, which we mistook for the 4 Series Gran Coupe. We apologize for the mistake.
The silver lining is that the 3 Series GT is looking sleeker/sportier than ever.
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