I am willing to bet that it is a soft top, they will keep 6 series as a high end convertible, meant for the "older" crowd and those guys want a soft top because its not their daily driver. I am confident in this!
2016 BMW X5d - Black Sapphire on Terra
2017 Range Rover HSE TD6-White on Ivory
2010 Audi R8 V10 Coupe 6MT-White on Red - gone but not forgotten