When it comes to the eventual replacement show and that leaked video...
For me, Illuminations was one of the things in Epcot which actually worked. It's still one of my favorite nighttime shows, and it's bona fide proof that Disney can have a great nighttime show without characters. Variety is the spice of life, and Illuminations was certainly different compared to the other nighttime shows.
So to have it replaced with another IP-driven show just like all the others*, this is a homogenization that I personally don't want. If I want to see a IP show with fireworks, I'll go to MK and see Happily Ever After. If I want more of a stage show, I'll endure Fantasmic! Illuminations is the fireworks/fire/water extravaganza with a amazing soundtrack, and soundtrack-wise I don't think foreign language versions of Disney songs is even going to match that.
Another factor is this, Epcot doesn't have the best history when it comes to replacing things. In fact it probably has one of the most tragic histories in theme parks with replacing things that work with inferior or lesser attractions. Horizons to Mission: Space, Imagination to TWO increasingly worse attractions, the 1994 SSE to the half baked version we have now.
Now with that said, will I give the new show a chance? Yes. But I'll be honest, I don't think Disney is going to make this easy on themselves due to two words...Epcot Forever, the interim show between Illuminations and it's eventual permanent replacement. By all accounts, Epcot Forever is gonna' go right into Epcot's nostalgia, and we know how Disney thrives on that kind of stuff, especially since fans eat it up. If Epcot Forever is very well received, then it's going to make the permanent replacement all the harder to make it's mark, as people could point and scream that the interim show was the better replacement.
Above all, I may not be fond of what the full replacement is, but it's gonna' be a interesting couple of years.
(*= Rivers of Light may not have IP's yet, but you know it's coming with how much of a whiff that show is.)