Boo .. but at least it sounds like it isn't a quick reaction to the recent protests. But it definitely felt inevitable.
Taking Br'er Rabbit and Br'er Fox/Bear out of the context of Song of the South (which the attraction does not reference except the Zip A Dee Doo Da song) ... I don't feel they are any more stereotypical than Raymond or Louis is from Princess and the Frog.
From strictly a "Disney" perspective, Br'er Rabbit, while a fun character just isn't in the current Disney ethos --- since the movie isn't available anywhere and they've never just pulled the cartoon parts out to show on video or streaming platforms, and they don't really do any books/merchandising (besides the rid itself) of those characters. So most people 0-30 nowadays don't know that story (while someone of my generation (45+) does -- I grew up on it. My dad still has Br'er Rabbit Disney books we read to the kids when visiting (so they know them a bit).
It seems like a natural fit .. just traveling through the swamp instead of a river -- though not sure what the big drop will turn into since there is no "briar patch" in Princess and the Frog.
I hope they don't make it too scary or non-kid friendly by incorporating the Voodoo elements of Princess and the Frog into it.
Zip a dee do dah .. is just such a classic song!