dual purpose tailights... interesting concept, that probably won't make it to production for a long time

at least two journalists said that the wastegates vent through the taillights, but we've also heard they'll be used to vent hot air from the engine compartment. The area to the right of the light appears to be open and looks a little vent-y. In the image above, we can see what appears to be some kind of light mesh sitting behind the open area in the light.

http://autoweek.com/article/car-news/ford-gts-mystery-taillights