I'd also expect the 9/11 WDS presentations to mirror their ShoWest and "Summer Heatwave'-esque events of the past with numerous announced and surprise celebrity appearances. They'll need to announce some in advance to nudge ticket sales and hold others back for the curiousity factor. Those events always feature promotional giveaways of the t-shirt/mini-poster/etc. variety.
Some obvious names would include 'The Princess and the Frog's co-directors Musker and Clements, and possible performance as they did recently, with star Anika Noni Rose and composer Randy Newman and Jim Carrey and Robert Zemeckis representing 'A Christmas Carol'. Carrey could own that convention center in an Anaheim minute which he needs to. Bruce Willis' sci-fi thriller 'Surrogates' opens September 25th so that should receive a healthy push as well.
Looking forward into next year's early releases they could pull from 'When in Rome' with Kristen Bell (also currently shooting another Disney comedy, 'You Again'), 'The Last Song' with Miley Cyrus, Greg Kinnear and Kelly Preston and of course, the 3D presentation of 'Beauty and the Beast' with producer Don Hahn and hopefully that film's stars and composer Alan Menken.
And then the big guns of Tim Burton's 'Alice in Wonderland' and 'Toy Story 3'. Some friendly arm-twisting could lead to walk-ons by Johnny Depp, Tom Hanks and Tim Allen. Everyone should hear Hanks when he gets on a roll in front of an adoring live audience!
Plus Team 'TRON' with an updated promotional push, Nicolas Cage's live-action 'Sorcerer's Apprentice', a 'Rapunzel' presentation and hopefully an official start date (& appearances) inconjunction with the fourth 'Pirates of the Caribbean' film (just try to keep producer Jerry Bruckheimer off that stage) and the new Muppets movie would be a huge crowd-pleaser.
That's just off the top of my head though, official announcements forthcoming.