Don't overthink it. The statement covers the present (both programs) and future (combined program). A lawyer can find all sorts of exceptions and hidden meanings, but this is a marketing statement. Marriott would have a PR nightmare if they did something sneaky. They are a business that wants to attract customers, so they wouldn't want that. They have remained silent on so many features of the new program. The fact they've issued these assurances must mean they intend to honor this statement or they would have just kept quiet on this topic, too.