Tai Yasue gave an interview where he said he saw Big Hero 6, liked it, and wondered what Disney could do with the property going forward. He then remembered he worked WITH Disney and could try to convince them to continue the story in KH3.
In some of the trailer footage, Goofy's run animation isn't always implemented, so he just kind of walk-slides around at times. The result is pretty awkward and hilarious as it makes him look like he's hardcore power-walking.
One of the trailers sees Sora getting into water, then the current swiftly pulls him down stream. In the meantime Sora's arms are going all over the place as he tries to keep his balance.