The new sketches show the car's design in full, albeit exaggerated, and confirm the authenticity of leaked shots from earlier in the month. BMW has also confirmed the existence of a special First Edition car, which is is expected to arrive ahead of the regular production Z4 in March 2019.
Those leaked shots, from an unknown source, quickly spread all over the web after their publishing, showing the Audi TT rival's exterior and interior design. They show that the production roadster takes close inspiration from the original concept, with an exterior featuring a raft of technology inspired by BMW's latest models.
The car in the leaked images is badged M40i, which is expected to be the range-topping Z4 model. A shot of the engine bay confirms it will use a turbocharged 3.0-litre six-cylinder unit shared with the M240i, expected to produce about 350bhp.
In June, a series of patent images revealed the car's styling, showing the car's swept-back headlights, flat rear lights and wide kidney grilles, akin to the 2017 Z4 concept. However, these new pictures seem to be the first sighting of the final production model.