It is also not a simple replacement for the old system, but instead a complete revamp, including an all-new rewards list.
The Infinity Chest is located at the Dice Zone (accessed with the ::dicezone command). Although you need donator status to gamble, anybody can access the Dice Zone, and the Infinity Chest.
When you open the chest, it will visually scroll through all the rewards. Once it stops, you must manually pick up your reward (as if it were on the floor), and then start again.
The Infinity Chest in action.