The next generation BMW 4 Series has already been spotted! Although the current F33 4 Series Convertible does not end production until October 2020 (the current coupe ends production June 2020), the next gen G23 4 Series Convertible prototype is apparently ready to begin testing.
The G23 4 Series Convertible will return to a soft top.
May 26, 2020 -- G23 4 Series Convertible on the Nurburgring.
Update March 31, 2020
Here's the newest closeup look at the G23 4 Series Coupe prototype.
December 30, 2019 - G23 Drops Major Camo.
Most revealing look at the G23 4 Series Convertible yet. And yes, underneath the fake grille shapes in the front camouflage, you can see the large upright kidney grilles.
August 14, 2019 - G23 Spotted at the Nurburgring
May 5, 2019 - New Video
Updated April 18, 2019 with first top down photos:
Updated March 26, 2019 with first spy video:
September 25, 2018 Sighting:
September 3, 2018 Sighting: