I'm vibing, too, that this is going to involve large "scare zones" that aren't clearly marked but where the scareactors know their bounds, probably with overlap to allow interplay. The first thing that came to mind, to me, was closing night last year at Seven; we basically ran amuck in the street, having the Seven zone as our boundaries but the areas around our sins the specific... jurisdictions? The park, then, would be like the zone was and the individual hordes will have their own jurisdictions much like the sins. Did that make any sense? The idea that everyone has full reign over the full park just seems to be a bit too much. Imagine, as a scareactor, trying to find your tag out when you have the ENTIRE park to search.
Also, I'm sure sidewalks will still be safe. As I understand, they were off limits as a safety thing as much as they were for people to get a breather. Scaring people around the sidewalks, especially the curbs, creates a huge liability on Universal.
Will it be cool? Absolutely. I'm bummed that I moved and can't be a part of it this year, as an actor or guest. Have faith in Universal, all you skeptics!