The pre-order bonus is the "Prime Directive Pack" which comes with bonus cosmetics and weapons. The pre-order pack for the previous game was made purchasable so that will probably also happen here.

Physical Limited Edition of the game comes with an exclusive hardcore mode that has an extra ending and an exclusive skin. The physical LE is exclusive to the PS5/Switch consoles only for now.

"Vanguard Edition" was exclusive for pre-order which included exclusive specializations for nine of the vehicles in the game.

Pre-order bonus is an "Early Adopter Cap".

Pre-order bonus is for Anya Stroud/Adam Fenix multiplayer skins and also beta access which may have more cosmetics linked to it.

"As a special pre-order bonus, receive the cosmetic Raidou Glasses. With these glasses that were popular in the Taisho Era, his charm will increase beyond what one can handle."

Game is content complete if you buy the most expensive version. Europe got an exclusive resource pack for some reason.

Pre-order bonus was getting the deluxe upgrade pack for free.

Pre-order bonus - Early Bird DLC

Pre-order bonus is a special tank for your mouse pet and the Sunset Dye.