Busy, busy. BMW starts the day by leaving F1. And it looks like for lunch they're bringing a green sports car to the Frankfurt Auto Show. Maybe. According to Autotelegraf.nl, the new sustainable sports car concept will be inspired by the BMW M1 Hommage concept and will feature all the latest and greatest BMW EfficientDynamics (auto stop/start, regenerative brakes, electric powersteering, etc). But the hits don't stop there -- look for the concept to be built from sustainable materials, too. Big question: will this car be just a concept, or will a sustainable sports car actually make its way to dealers? Dunno. But the Dutch word is that BMW is studying the viability of said project and is planning on a limited release two-door showcasing their best environmental kung fu by 2012. Again, we just don't know, and we're not quite willing to hold our breath yet.