I agree that it is confusing. My take is that they will be demanding better oxidation control, less wear, reduced gelation with cooler temperatures, less ring sticking, better tolerance to bio fuel dilution and other criteria but not demand it for another year. They are giving oil vendors time to meet the new specification.
Interesting that despite all these "improvements" they state that it will require a thinner oil. This has certainly been a trend for the last decade. Despite the thinning of oils the performance in test engines and in real engines continues to improve. Successive API ratings have demanded improvements despite thinner oils.