The most recent canceled Disney project is Gigantic, which the company revealed at the 2015 D23. The film would act as retelling of Jack and the Beanstalk with "comedy and deep emotion" with a setting in Spain during the Age of Exploration. Disney tapped Frozen songwriters Robert Lopez and Kirsten Anderson-Lopez
for the movie's songs and even had them perform one on stage at that announcement event.
But Gigantic had some creative delays, even after Disney hired Inside Out writer Meg LeFauve to co-write and direct the movie. In the end, Disney had to admit defeat and stated that the movie's concept just wasn't there.
What's really sad is that the movie's production was moving along fine: it was pretty far into its development phase. Now, though, it's as if it never existed.