The V8 BMW M8. Due sometime in 2019, the M8's twin-turbo V8 will be pushing over 600bhp sending the behemoth from 0-60 in an unknown number of seconds. But most likely below 4.
If you were interested in purchasing one, you will have three choices; a cabriolet, coupe and a grand coupe.
However, starting in the region of £140k it might be a bit much.