More specifics:
[Annual] Unity Tiers: Cut-offs of $4K and $15K annual spend between the first three tiers (Star, Legend, Icon); fourth tier (X) is invitation only. One tier credit per dollar spent; separate variable rates for casino gaming. Resets every calendar year.
Unity Points: Earn 3 Unity Points per dollar spent, or 1 Unity Point for non-gaming spend at casinos, and separate variable rates for casino gaming. They are worth a penny a point, so essentially a 3% rebate at the Cafés.
Points expire without activity
every six months!