BMW have always thrown out some pretty awful looking bitsy concept cars before they hone the ideas into decent ones for production models. Pity the grille might from the 7 prototype not be one of those...
For example the Z1 coupe concept from 1991:
Pretty awful, but elements of it turned up in the e38 - which was a good looking car. A more refined version of the concept arrived as the Z3 coupe (aka the clown shoe) ect.