Treasure Island
Member
Here's my thought, based just on the press release and concept art. You can see in this picture of a mine car from the concept art (note this one is just part of the theming and not on the track) that there is a pivot at the bottom of the bucket which would allow it to tip side to side (to dump it's load in real life). By guess is that the bucket portion will be able to rock side to side on that pivot and will simply react to the motion of the car on the track.
I read Raven explained it that way too a couple days ago and showed a picture of an old rocking crib as an example. This pic of the cart is perfect and shows that as well! Nice!