Psyonix is introducing a new “Blueprints” system to Rocket League to replace loot boxes. The blueprints will be obtained following Rocket League matches, allowing the player to create an item for a set price.
The idea behind the system is to be able to see exactly what item is being created, and the system will be added to Rocket League as part of a larger update in December, which will also bring the introduction of a new premium currency, Credits. The new currency will replace Keys, and can be used to purchase Blueprints.
The exact date for this update hasn’t been confirmed as of yet.