Some of the changes according to TFW2005:
- A Carbon fiber Splitter on top of the roof of the new Camaro.
- New Side-Windows. (They are more "Pointy" than previous versions)
- New set of Rims previously unseen in Movie 1 and 2.
- New, much more open cut to keep the brakes of the Rear Tires cool.
- Black Stripes are now also on the roof of the car and carry a completely new design.
- New Side-Skirts.
- Newly added Front Splitter.
- Redesigned Fog Lights with a Guard.
- Overall Streamlined Design mimicking Chevrolet Stingray Concept (Sideswipe) with Carbon fiber Side Mirrors.
- A Rear Carbon fiber Spoiler.
I know nothing about cars so assume these are solid improvements to the vehicle. It will probably be awhile before we see how those modifications translate the Bumblebee's robot mode.