Titled Tangled: Before Ever After, the sequel will see the return of Mandy Moore and Zachary Levi in their respective roles. Basically, Rapunzel's hair grows back and it's apparently impossible to cut and they have to figure out why. Takes place before the other 2012 short film. The dark-haired chick is Cassandra, voiced by Broadway actress Eden Espinosa. She's supposed to be a friend of Rapunzel's. The sequel airs in March.
This is only the beginning. They're making a TV series, too.
Just an excuse to make a Tangled icon.