If you pre-order RAGE you will automaticallly get upgraded to get the Anarchy Edition of the game for no extra cost. The Anarchy Edition comes with the following:
Crimson Elite Armour
This is the most sought-after armour in the wasteland. Constructed of hardened plate armour, this gear was created specifically to withstand the toughest wasteland battles. It also features larger component storage, allowing you to carry more parts that will aid in the fabrication of advanced engineering items.
Double Barrel Shotgun
Wasteland settler design and ingenuity! Features compact form factor with plenty of muscle to take out everything from mutants, bandits and maybe even a lone Authority Enforcer.
Fists of Rage
A classic weapon for close quarters combat. When you’ve run out of ammunition and fists are the only option, these razor sharp knuckle blades will give you that combat edge.
Rat Rod Buggy
Improve your odds of survival in the wasteland with this vehicle that comes equipped with a front smash guard and durable protection.
The Anarchy Edition supposedly will have extra modes that come with it to, including co-op missions. View the details on the modes here.