Yeah, their server crashed for a while today. Here's some of the pics from the Game Informer article, all just concept art.
Optimus Prime (obviously)
Megatron (obviously)
Ironhide, Soundwave, and the guy at the bottom kinda looks like Onslaught but could be somebody else.
And a scene of Optimus fighting some Deceptiocon whose prolly a generic for gameplay.
There's more pics, but these kinda get the general idea. As long as the game's good, I'm happy. They've done a few stabs at the transformers on Cybertron before and they turned out ok. So the concept works for me.