Okay, I take my other comment back, since I'm thinking now instead of assimlating like a lot of others -_-
All they're doing here is taking the same basic idea and re-animating it, with new characters and animations themselves. They may look the exact same in movement, but seriously: imagine how much longer it would take to make these movies if they had to make a new animation scene every single time. A very long time, and it already takes a really long time to make them.
Don't go dissin' the classics. As simlar as they may be, they're always going to be the same Disney classics that they haven't made forever, but that's a whole other thread idea there...