Here is a 6th gen concept from designer Brian Geiszler, who did an internship at GM. After finishing with GM, he undertook this 6th gen Camaro concept on his own [see more sketches from Geiszler].
According to Geiszler:
This project was created in my 7th term Studio at Art Center. During my internship at General Motors, I designed a next generation Camaro interior, so I figured why not make it a complete car once I came back to school. The intent of the project was to add an extra level of surface sophistication and change up the proportions a bit, that’s where the fastback look came into play, which is a first for Camaro.
See more sketches at the following LINK