Po is gearing up to become the spiritual leader of his Valley of Peace, but also needs someone to take his place as Dragon Warrior. As such, he will train a new kung fu practitioner for the spot and will encounter a villain called the Chameleon who conjures villains from the past.
It was pretty good, not better than Kung Fu Panda 1 or Kung Fu Panda 2, but good. Im sad that the Furious 5 were not in the movie though :( To me, the villain felt really random. What I really liked about Kung Fu Panda 1 and 2 is that the villains felt real and had a connection to the main characters. Hopefully if there are future Kung Fu Panda releases there we will see deeper plots like in 1 and 2.