Expect MAJOR congestion in Adventureland, Frontierland, New Orleans Square, and Critter Country for the next 1 1/2 weeks.
Bleachers moving in soon. Frontierland will have no access to New Orleans Square or Critter Country, and Adventurland will be divided into 2 way traffic lanes with cross-overs for attraction/shop access.
The day of the event will see all of Main Street, USA and the Hub turned in to one big "round about" much like you saw with Candellight, though on a bigger scale. The park closes at 5pm that night, but DCA will have extended hours.
Remember to plan ahead, avoid the West side if you can, and of course, be patient with fellow guests and Cast Members.