I'm not sure why everyone is linking the TF4 Bumblebee car to the 6th gen. The TF4 car is most obviously inspired by the 2014 Camaro than anything else. The futuristic look in my opinion is only due to the direction the TF4 movies are going in. Take a good look at what Optimus Prime looks like for the 4th movie.
We really know nothing about the 6th gen Camaro except that you can bet it will have an LT1 from the C7 under the hood and probably the 7 spd transmission as well. There have not been any official concept cars or sketches released, nor any camouflaged 6th gens running around GM testing grounds. At least not that we know of.