That sound you hear is a billion parents' wallets screaming in terror.
From a business standpoint, this is a brilliant manuever. By attaching this new short to the upcoming live-action Cinderella remake, they not only build buzz for a movie that wasn't exactly setting the world on fire, they ALSO get to keep the nuclear explosion that is Frozen burning at critical levels. Once you have something that makes this much money, you simply can't LET IT GO.
You hear that, adorable little children happy to see their favorite characters again? You're puppets! You're ALL puppets!
Here's the preview: