I am also taking the same flight as you in late-September so we're both in the same boat.
Mitchja has answered the questions well. This is all we have at present with respect to social distancing in parks...
https://www.goodmorningamerica.com/trav ... g-70451998https://www.cbsnews.com/news/disney-wor ... ing-masks/It doesn't appear to be the final plan as yet, but it's something the parks will need to plan and implement as it will be a challenge to ensure everything is kept clean and people comply with it. The reduced capacity proposal doesn't come as much of a surprise given the confined spaces of some rides, though it will be interesting to see how this works and whether you have to pre-book your day. It wouldn't surprise me if virtual queues are implemented as it will reduce the amount of people being confined into queues in physically small locations.
Finally, whether we can go anytime soon will depend on the following...
*FCO lifting its advice against all but essential travel
*US lifting its own restrictions (the UK and other European countries are on the current ban list)
*Parks not prohibiting access to international visitors
*Agreeing and implementing workable solutions
It's a big dilemma for parks to come up with workable solutions to this. What Disney are doing at Shanghai could be an indicator of what to expect in Orlando, though I can't imagine it will be comfortable wearing a face mask for several hours in the Floridian climate. I also see Disney Springs is planning to reopen next week, so that's probably another way of finding out what Disney's thinking is of managing social distancing. I can't see Universal's plans being much different to Disney's.