Robotkingdom pre-orders for these figures can be found here, they expect to start shipping on December 28th.
Here you can see the colour of the material is darker for all the yellow part of bumblebee.
The grey colour on the body and his wings changed to black and it gives him a cooler look.
Darker colour on his head, Front panel become grey rather than white.
The Red colour of the arms also become darker and more metallic, but it is hard to tell from the picture.
The blue colour on the leg turns into a more purple tone.
The grey colour on his shoulder is now closer to white.
The grey colour on his chest is darker.
The material becomes more shiny by metallic and darker, but it is hard to tell from the picture.]
I guess I don't need to say anything about him right?