If you have been under a rock, you should know that the vastly popular Phineas and Ferb cartoon series is doing a special hour-long crossover this year with Marvel characters Iron Man, Hulk, Thor and Spider-Man. It debuts here in North America August 16th.
The other big crossover, as stated in the "Disney Buys LucasFilm" thread is the 2014 summer crossover will be with Star Wars, running alongside the events of Episode IV: A New Hope. What do you think? Are there any good crossover ideas out there in the vast Disneyverse you'd like to see?