If I were to guess, I would bet each park will reopen with just 1000 people allowed per day (possibly split into 2 entry times to accommodate 2000 people) and with staggered entry and exits for those guests (with colored bands distinguishing who needs to leave, ala trampoline parks) and with a prescheduled meal hour. I'd expect about 10/12 attractions/shows, 2 restaurants open and no stores...and I'd expect they'd give the arriving guests ride passes and a set show schedule for their bands...
There'd be no hopping, no arriving early, no leaving late...your time frame is your time frame.
I'd also expect this would be "drive in by personal auto" only, with guests walking in and no trams. Not sure how they could make MK work that way since you still have to head in from the drive...it might be the boat method only running with 200 people (100 each deck)/hour...
As for price - who knows - it's Disney - and this would be exclusive and yet limited...so pick any number you want...