I don't think there are specific
DVC related policies around face masks. DVC resorts simply follow the broader WDW resort rules.
What these changes mean, both for the WDW DVC Resorts, and the broader WDW Parks and Resorts in general, is that: If you are aboard any WDW transportation (boats, monorail, skyliner, bus, etc. etc.) then you MUST wear a mask regardless of vaccination status. If you're vaccinated, you can wear a face mask if you wish, but you are free to not wear a face mask anywhere else. If you aren't vaccinated, then facemasks are required everywhere (indoors and outdoors) except if you are actively eating/drinking while stationary.
Simply: If you are vaccinated, then you must wear a face mask on transportation, otherwise you are free to wear or not wear a mask that fits your desired level of comfort. If you aren't vaccinated, then the old face mask rules apply from before they started removing the requirements.
I also think that any 3rd party establishments at WDW (think swan/dolphin, shops at Disney Springs, etc.) are free to be more strict if they wish...so YMMV.