After some debate, the general consensus in the spy community now is that this vehicle is the forthcoming Z9 – a successor to the BMW Z8 and a competitor to the Mercedes SL. Originally thought to be the next-generation Z4, closer inspection suggests that this could be BMW's SL-fighter. This prototype is clearly larger than today's Z4, but that also supports earlier reports that the next-generation Z4 would be growing up a bit to make room for an entry-level Z2 roadster.
The most noteworthy details on this prototype are the side windows – a glass-to-glass like that of the Mercedes SL. Is that enough of a clue to prove this is the Z9? Quite possibly, especially when taking into account the slim, sleek convertible roof and considering that the Z9 is aimed squarely at the tin-topped SL, and is reportedly similarly equipped, and the clues further point to this as the Z9.
Tell us about your car in our Driver Power survey.
For more breaking car news and reviews, subscribe to Auto Express magazine. We'll give you 6 issues for £1 and a free gift!