They had it in Walt Disney World this weekend for the car Expo. It hasn't been at Disneyland though. I believe the people who talked about it on here went to it in Florida.
I played through the first area of pirates and guided quite a few people through it and played a bit of cars, I preferred pirates but can't wait to play all of it
"Disney Infinity will have another booth with demo stations on Aug. 16 near Once Upon a Toy at Downtown Disney Marketplace. A Disney World cast member said that she hopes the game will be available for purchase at that time, and she expects developers to be there to answer questions and sign copies."