From the back of the box:
The search for excitement is over with the Finding Dory edition of UNO! Play the Just Keep Swimming Card to keep the action moving! Use the Customizable Cards to create your own memorable rules! And don't Forget to yell "UNO!" before you play your last card!
Details about the two unique/new items in this version:
Just Keep Swimming Card - acts as a wild where the next person in order has to keep drawing until they pick a blue card.
Blank Cards - allow you to create house rule cards.
Both card types are worth 50 points if they are in your hand at the end of the round.