The character on the cover has been blacked out, but the body shape seems to hint at the new Megatron design. Also present are what appear to be body parts of the Decepticon casualties from the first film (Blackout, Brawl and Bonecrusher).
See the cover by clicking here.
![Image](http://seibertron.com/images/news/gfx/1230038660_Defiance_3.jpg)