Hi Kim!
You're speaking my language with popcorn! I am addicted to the popcorn at Walt Disney World and love using the refillable buckets to get discounted refills. With the amount of popcorn the four of us eat, we definitely get our money's worth out of them.
Disney Springs does have a popcorn cart with the refillable popcorn buckets. It is by the water in-between
World of Disney and
Ghirardelli Ice Cream & Chocolate Shop. I was just at this location last week getting a refill and the design they had was all four park icons with Mickey, Minnie, Pluto and Donald acting like tourists with a blue lid and handle. I did see a recent article on Disney Food Blog that Disney's Hollywood Studios debuted a new popcorn bucket featuring Pixar characters like Eve from Wall-E, Remi from Ratatouille, Jack Jack from The Incredibles, Woody and Slinky Dog from Toy Story as well as attraction icons from the four parks with a deep turquoise lid and handle. As far as I know, these have only been spotted at Hollywood Studios, but they could be popping up everywhere since it isn't a park specific bucket.
If you plan on visiting Epcot during your visit, stop by and refill your bucket with flavored popcorn! It's the same refill price as regular popcorn and you can choose from cheddar cheese, buffalo bleu, sour cream and chives at the cart nearest Journey into Imagination with Figment. The
Canada Pavilion also has maple popcorn that is
delicious!
Have a magical day!
Leslie