This is an actual thing that is happening. Phineas and Ferb is doing a Marvel crossover special called "Phineas and Ferb: Mission Marvel" and they released a few stills at Comic Con this weekend. So cool.
Disney/Pixar actually had the DunBroch family tartan from Brave officially registered! That's it up there, and there's a lovely bit of information about it over here.
Oz the Great and Powerful has a trailer! It looks...interesting. Maybe a little too much like Tim Burton's Alice in Wonderland for my taste.
Eric's castle from The Little Mermaid is starting to look like a castle in new Fantasyland! It's so cool to see the different architecture come to life! Source.