I have a horrible memory for things, but I've done both W&D races and I'll see if I can help:
-- Yes, there are characters on the course. For the life of me, I can't remember who specifically, with the exception of the Green Army Guy on one of the hills. And the characters aren't restricted to the parks. In fact, I remember more characters/picture opportunities OUTSIDE of the parks.
-- I said "one of the hills". There are actually a couple, but it depends on what you call a 'hill'. Living in FL, that's anything that's not flat (including an overpass going over a road, overpass going over the entrance to HS, and overpass going between S&D & Y&BC resorts). And if you recall, AK is a bit hilly as well.
-- Yes, there is a 2-day expo, along with kids races, and a 5K race as well. In the past, the 5K race included a ticket to the Halloween Party on the Monday following race weekend, but not sure what they'll have this year since that party will be long gone. (Perhaps the Christmas Party?)
-- The theme parks that the W&D race goes THROUGH are Animal Kingdom and Hollywood Studios (start at ESPN). The first year, the finish dumped INTO World Showcase at Epcot --horrible setup!! And last year we went around the back side (as in back stage) of Epcot and dumped into the parking lot/taxi pick-up area. Then, you made your way into Epcot for the after party -- MUCH better setup!!
Hope this answers some questions for you.
Oh, one last thing for our Aussie friend: you won't be eligible for the CtC with the races you mentioned running. It has to be both races in 2012 or both in 2013 - you can't carry over, unfortunately.
