I guess I'll reply to myself, just in case anybody has already read my previous post.

What I've found so far on the 2011 BluRay: All of the Deems Taylor narration is replaced. Every single last word. I'll be replacing these back to actually being Deems Taylor. As much as I like Corey Burton (who I'm pretty sure is the voice actor on the 2011 BluRay) it ought to be Deems Taylor, who had a huge part of the Fantasia process.

By the way, I didn't mention before but I will be using the 2011 BluRay in 720p as my source for the video. I had intended on keeping the narration and such from the BluRay, until I found that the narration was replaced. I'll probably do a version with the Deems narration and the Stokowski soundtrack, as well as the version with the Deems narration and the Kostal orchestration.