Update: We have a couple of additional screen shots of GameStop's G1 Retro Optimus Prime courtesy of EGMNow.com, see below:
Pre-order Bonus Offer
Transformers G1 Retro Pack
Pre-order Transformers: Fall of Cybertron and receive the Transformers G1 Retro Pack!
Transformers G1 Retro Pack:
G1 Retro Optimus Prime: Play as the leader of the Autobots in his classic original robot and vehicle forms. Available in both Single and Multiplayer Modes.
G1 Retro Megatron Gun: Single Player Mode
G1 Retro Shockwave Cannon: Single Player Mode
Online Customers: Code will be emailed within 2 business days after your order ships.
Store / In-Store Pickup Customers: Code will be printed on your receipt at time of pickup.
Here's a couple of additional images of G1 Retro Optimus Prime courtesy of EGMNow.com: