The drop-top hybrid’s development has long been rumoured, but company CEO Harald Krueger confirmed its launch year to Autocar at the Paris motor show.
BMW’s boss refrained from revealing any more details, but the convertible, which could adopt the BMW i8 Spyder name, is likely to be first be shown at the end of 2017 when the i8 facelift is revealed.
The roadster’s design will incorporate some features of the BMW i Vision Future Interaction concept (pictured) that was at the 2016 Consumer Electronics Show (CES), including a pair of rear buttresses.
Like the rest of the updated range, the i8 roadster will also adopt an upgraded petrol-electric powertrain with a more potent motor than the 129bhp unit used by the existing i8.
Combined with a lightly fettled 1.5-litre three-cylinder turbo petrol engine, the front-mounted synchronous electric motor is claimed to provide the facelifted i8 with a boost of more than 10% in power over today’s model, lifting the 2018 i8’s output to around 420bhp.