I found this on the park blog:
"A reservation will not be offered or required to experience Star Wars: Galaxy’s Edge at the Walt Disney World Resort at this time."
The "at this time" leaves it open for them to change their plans.
We don't know for sure how this will be handled in Florida. Once they see how things go in California we will probably hear more about how it will be handled at DHS. Martin has already indicated that there are plans for some way that people won't have to wait in line to get into the land.