The past two years, people were able to switch from previously reserved rooms to Free
DDP packages at the higher room rate. That is no guarantee, of course, that the same rules will apply this year. We won't really know until the actual announcement is made.
Personally, since everyone is expecting an announcement in a few days, I'd wait to protect myself from the possibility that they won't allow switches.
We know the UK and Bounce Back promotions were very successful, and the speculation is that
IF free DDP is offered, it will be for fewer rooms for a shorter period of time...so it's
possible they might say no switches. They are, after all, looking for
additional business...not changes in existing business.
If you know your exact dates, I'd go ahead and make your ADRs if you are ready to do that. ADRs have nothing to do with where you are staying or how you're paying for the meals.