Ok, so we know some of the names are placeholders. Roberto Orci recently reconfirmed this.....bay wasn't fibbing. In the leaked, old version of the script megatron is found by humans, buried in the ice, at the beginning of the film, and only appears later at the end of the movie. There's a tank transformer in the film, with the "name" devastator. Megatron apparently has talons on his feet, no earthen form, and can fly. WHAT IF...... Devastator is really megatron. And the transformer who is found at the beginning of the film and finally released at the end....is none other than Unicron.....taloned feet and all. It'd make for one hell of a twist. And I like the idea of a normal sized, but still insanely powerful, unicron.