The Disney capacity limits are a well kept secret. I doubt there are many people who know the answer and it wouldn’t be wise to share it here if they did. From the original re-opening plans all the way back when Shanghai was opening, Chapek said they were going to keep capacity limits very low to start out (well below what the government would allow) and ramp up over time as they got more comfortable they could successfully handle the crowds and also as conditions with the virus improved. For WDW conditions didn’t improve when they opened they got worse for the better part of the summer. As the summer wound down and conditions improved some they could have increased capacity limits but we will never really know.
As far as the executive order goes the initial release from Disney is they would assess the impact to their business but there were no changes being made to current protocols. I suppose that could change in a few weeks but not likely. On the hours topic, I could be wrong but I thought they just increased hours back to the original 10 hours a day only on the weekends. The parks are dead during the week and more crowded on the weekends due to locals. I would think if they anticipated a larger increase in demand from tourists they would open additional resorts to fill the need. It seems like WDW is largely getting by on the backs of local AP holders. Fireworks are a possibility but I would think they would be hyping that to get holiday bookings up. Disney has tried to highlight the holiday offerings but no mention of fireworks, just the castle projection show.
In Disney’s release in reaction to the executive order they went out of their way to reiterate that their mask rule still stays. I don’t think they will budge on that any time soon without a significant improvement in FL. I could be wrong on that, it wouldn’t be the first time I was wrong.