There is about five minutes worth of storyboards here from the upcoming fourth season of My Little Pony: Friendship is Magic. It was previewed at the MLP panel at SDCC 2013.
Contained within are scenes with the Cutie Mark Crusaders (and their bullies), Spike and the “Power Ponies", a song with the Apple family and Pinkie Pie, and the return of Nightmare Moon. Minor spoilers ahead.
Really enjoying the Applejack song <3 I didn’t much care for her previous and only one before this.