Not sure if this has been posted before, but it's the first time I've seen it:
From Marriott International's recent Security Analyst Meeting :
Marriott anticipates a renegotiation of terms for its branded credit cards, which could increase loyalty program contributions and reduce hotels' card-processing costs. The Marriott Rewards Visa through JPMorgan Chase agreement expires in 2018, while the SPG American Express card expires in 2020.