There are many car enthusiasts around the world who really like the idea of BMW i8, but they don’t actually love the roof of it. Well, exactly for these people BMW will be building a roadster version next year. We're pretty sure the electrifying performance will be very similar to the coupe, so we’re talking about an electronically-limited top speed of 155mph and a 0-62mph time of 4.4 seconds. The roadster might lose a couple of tenths to the hardtop, but it shouldn’t be any less rigid or agile – the carbon-tubbed i8 was designed to have coupe and roadster variants from the start. Cosmetically, not much has been changed from the coupe, but the roadster has earned a pair of lovely buttresses. The roof seems to be more of a targa arrangement than a traditional folding canopy, and we think we spot a new alloy wheel design too.