I listened to a podcast from August 4, I think the date was, of a round table discussion of race directors, including Jon Hughes, who is Track Shack Co-owner and Race Director of the Walt Disney World Marathon. Basically everything is fluid now and subject to change (for all races, not just Run Disney ones), and likely it won't be until a couple weeks prior to expos that it is really known what procedures will be. From the discussion, it seems likely expos won't be quite the way we are used to them from past experience. There may be fewer vendors, restrictions to the number of people allowed in at one time, they may ask that you sign up for a specific time slot to go to the expo, etc. And it's possible that the Wine and Dine expo will have different guidelines than Marathon or Princess, based just on what the situation is immediately prior to each race.
In short, having listened to the podcast, I would not expect expos for the Run Disney races coming up to be exactly the same as what we have had in the past.