Holley Shiftwell Video with Playable Perry the Platypus

Jack Skellington and Wreck It Ralph were shown riding in Cinderella's carriage from the player's perspective during the video presentation at the El Capitan, so it's safe to assume that they will indeed be playable avatars with figures as well. So far, at least, we haven't seen NPC characters riding in vehicles. Characters like Ramone, Rex and Vanellope, for example, have been seen in the game, but so far not in a way that distinguishes them as definitely playable characters.

*needs a playable Rex*

There should be a Phineas and Ferb Playset with Phineas, Ferb, Perry, and Dr. Doofensmirtz, that would be awesome