I'm thrilled that this is being seriously considered. I definitely would buy this type of upgrade for at least one i3 (2015). 40Kwh most likely, but also interested in larger batteries. If this becomes a reality it would probably prompt me to buy a BEV i3 which is otherwise problematic for non-urban driving in the PNW. BMW's failure to update this otherwise excellent design makes this an incredibly attractive proposition for those of us who normally own a car for a decade or two.