This is a cut and paste directly from the WDW website. It's on the CSR page, on the right towards the bottom.
"TIPS & FUN FACTS Purchase a refillable mug, available at the Pepper Market and La Tienda, to enjoy unlimited hot and cold beverages from Riverside Mill and Sassagoula Floatworks and Food Factory at Disney's Port Orleans Resort French Quarter throughout your stay."
When did they change the mug rules?
"TIPS & FUN FACTS Purchase a refillable mug, available at the Pepper Market and La Tienda, to enjoy unlimited hot and cold beverages from Riverside Mill and Sassagoula Floatworks and Food Factory at Disney's Port Orleans Resort French Quarter throughout your stay."
When did they change the mug rules?