From DPB:
So it does look like there will be some educational / inspirational aspect where we learn about the formation of our Galaxy. Yes, it's tied to the fictional world of Xandar, but it doesn't look like it's entirely frivilous. We will have to see how it turns out in execution, but this is the first sign of something that is Epcot appropriate I've seen (and not just Peter Quill visiting as a kid) and is in line with the theme of Discovery.
I can't speak for DCA, but I think DHS has better thematic cohesion now than it has for years since it ceased to be an actual production studio. I'm willing to see Epcot through - there does seem to be a connective tissue here that isn't quite the same as EPCOT center, but is in its spirit to a point.
Less about technology, and more about our world, and its people, and the magic of possibility, hope and wonder, as we imagine the future we can all create together as one.
That classic is mostly staying the same (it was already rehauled in 2007 away from communication and towards building the future). The fountains are about water, inspired by Moana. I wouldn't necessarily call them "Moana fountains". And from what we know, there is more coming.