Sad that the i3 concept didn't take off, I loved it, together with the i8 (if only that one had a larger engine...)

Interestingly enough the i3 and i8's carbon structure helped the G11 & G12 (short and long wheelbase BMW 7), the G14/G15/G16 (BMW 8 series) and the F91/F92/F93 (BMW M8) shed a lot of weight.

But for the newer version of the 7 series don't use that structure anymore, as the weight savings are nullified by the battery pack.