There are some non-cosmetic (e.g. Marriott loyalty programs -> loyalty program) changes in here.
2.1.b now includes taxes, spa, etc. as a part of some properties - albeit only three.
2.1.d.goes more restrictive on a terms change from same day check-in to the same property to within 24 hours.
2.8.a- points transfers between accounts raised from a cap of 50K/yr to 100K/yr
2.10.a. Merchandise through MORE, 2.10.d on Diner's club Club rewards to points removed from old terms (absent in new terms)
3.2.e.iii - removes reference to Free Night Awards at the following locations require a higher amount of Points - figure category 8 rollout + offpeak/standard/peak pricing made this redundant, replaced with a clause that the WEstin Golf Resort & Spa, Playa Conchal, Costa Rica & Sheraton Bijao Beach Resort, Panama have fees for third plus guests beyond award redemptions.
3.2.n.i - Pretty much any Marriott property may limit the number of standard rooms available for redemption on a limited number of days - another kick in the teeth on the no blackout benefit
3.5 - due to MARSHA/OPERA integration at SPG properties rather than legacy SPG backend PointSaver awards are generally available rather than just at legacy MR properties
3.7.e. - similar but for instant redemption awards (now available at legacy SPG brands)
3.14.b - new clause that Travel Packages are excluded from airline partner conversion bonus campaigns. More information on the Travel Packages may be obtained here.
4.3.a.III - an honest to god enhancement where plat (50)/titanium (75)/ambassador (100 nights + $20K eligible spend) elite members are not only owed cash compensation but a minimum of 90,000 points if they're walked from many Marriott brands (140K points in addition to the cash at Ritz/St. Regis)
Section 7.2 for Vistana - larger differences, not familiar enough to assess what they are.