The successor to the BMW Z4 has been spotted testing again, this time conducting test runs at the high-performance playground that is the Nurburgring Nordschleife. It isn’t the first time the upcoming two-seater soft-top has been spotted at the demanding racetrack – it was spotted there last year in a more concealed state of dress.

To recap, we know that BMW’s two-seater will be ragtop-only, while the co-developed Toyota Supra will strictly be a coupe. Inside, the next Z4 appeared to offer glimpses of an interior that was near-identical to the next Toyota Supra’s (the two are co-developed) in an earlier sighting, though there aren’t any more recent images to show if the interiors of both cars have since been further differentiated.

Power-wise, the next Z4 will come to market with BMW’s range of four- and six-cylinder turbocharged engines, with the most powerful variant gaining a hybrid powertrain with capacitors and all-wheel-drive. The B48 four-cylinder turbo petrol is expected in perhaps two states of tune alongside the B58 turbocharged inline-six, according to a Car article.

Both the BMW and the equivalent Toyota stand to gain from the German manufacturer’s expertise in working with carbon-fibre, with its experience in the construction of the G11 7 Series as well as the BMW i3 and i8.

For now, the actual name of BMW’s upcoming roadster has yet to be confirmed, despite earlier references to its Z5 moniker. With both cars rumoured to be constructed by Magna Steyr, the BMW is expected to debut at or around the same time as its Toyota twin, currently estimated to be later this year or early 2018.