Outside the AMC theaters in Downtown Disney, they have banners advertising the movie.
At California Adventure, they are changing Toy Story Mania to include new characters from the movie. They are doing this to Toy Story Mania at Disney World as well. A game called Rex & Trixie's Dino Darts will be replacing Bo-Peep's Baaa-loon Pop.
Also, a new character has been added to California Adventure's Pixar Play Parade! The character's name is Lotso, short for Lots-O'-Huggin' Bear!
Finally, just past Toy Story Mania, there is a display set up where you can take your picture inside of a toy box!
I'm pretty excited for Toy Story 3. I love the first two films and am looking forward to seeing Buzz and Woody and the gang back on the big screen!