I was there at D23 and I reported on the the Rapunzel footage for the site.
They showed some very brief clips, very basic stuff like Rapunzel going down the stairs. Things like that.
The movie is going to be a musical. Its also going to be a swashbuckling adventure. Rapunzel will know how to fight and know like martial arts. She even uses her hair as a weapon and Indiana Jones type of whip.
Zach Levi plays the male lead suitor for Rapunzel, I forget his name, but check out my D23 coverage to knwo more.