No, I didn’t know that Porsche came close to replacing the 911 with the 928. Both cars are awesome.
Lots of cars had concealed headlamps but not anymore. You can get a list of them by googling “cars that have hidden headlamps”.
Porsche wants to immortalize the 911. Future generations of it will probably have the same overall classic shape that it does now. The 928, no longer in production, was a different car altogether. The 928 had a conventional front engine rear drive drivetrain whereas the 911 has a rear engine rear drive drivetrain. The 928’s round headlamps are different from other cars hideaway headlamps. They don’t retract and hide. Instead, they tilt back onto the hood when not in use and point straight up. When the headlamps are turned on, a small electric motor pushes the headlamps so that they face the front of the car.