If you come across any prototypes in spy pictures, or you encounter any in real life and are not sure what they are, post the pictures or descriptions here. The members will do their best to help you identify the vehicle.
Which brings up this again:
The rear lights are different than the actual 3er design that can be see in the press pics. So what is it, 1er sedan? 3er wagon rear lights (unlikely but who knows), or just a different design for the sedan's lights which were rejected. But why a complete shell of the car then?