Last year in November we booked a DVC rental at the Grand for this coming Sept 13-17. When the lockdown started I felt quite confident that this would be fine by that time. It was 6 months away. Of course now its just a wait and see thing. I am due to make the final 40% payment on the DVC rental at end of July so I have to make a decision by then to cut my losses. Already have airfare tickets reserved and paid (great price $49 each way) and that can be used later if needed. But the rental portion I've paid so far may be lost. I have not seen any real solid info about anything that can be done for the DVC owners/renters.
I also have a Marriott timeshare and their policy is to let you cancel and either use it within 120 days, or put it into Interval International. Don't know what the DVC folks can do.