Credit goes to DJ3xclusive from SD
Here is the full list of everything you will receive:
13 Month XBox Live Gold Subscription ($65 Value)
Metal Gear Rising: Revengeance Steelbook Collector Case - This was only available with select preorders in the UK, and was never released in the US
Halo 4 Corbulo Emblem Avatar DLC Code - This code gives you the Corbulo Emblem to proudly display on your in-game avatar in Halo 4 for XBox 360.
Metal Gear Rising: Revengeance Commando Armor DLC Code - This code unlocks the ability for Raiden to access an increased number of projectile weapons.