The chances of Disney reusing the America Sings AA's are pretty low considering the trends and logic behind this overhaul. It depends on a couple of unlikely things. One being that the imagineers have fallen to a level of such extreme incompetence and lack of attention to detail that they don't know or don't care about the massive differences between the character designs and proportions of the Splash Mtn animals and the ones from PATF.
Look at these birds from this scene in PATF-
Now look at these from Splash Mountain-
The vast majority of Splash Mtn's animatronics are in this nebulous middle ground where they are simultaneously far too anthropomorphic to be reused for PATF's more realistic animal designs, but also entirely the wrong shape to be reskinned as humans. Louis is one of the only animals in the movie that has a shape you might be able to adapt from an existing animatronic (perhaps using parts from Brer Bear). And some of the tiny animals with more simplistic movement might also be reusable if you remove their clothing (Mr Bluebird, Roadrunner and the other smaller miscellaneous frogs and turtles). But that's about it.
The other problem is that the executives will be thirsty as all hell at the opportunity to gut yet another animatronics heavy ride in favor of one with much emptier and more sparsely detailed rooms. I don't see them approving anywhere close to the same amount of newly designed animatronic figures either.
My prediction is that much like the Frozen ride, much of the physical scenery will be gutted and replaced with empier hallways of projections and lasers (specifically for fireflies and other small bugs and birds). Any physical animal figures are likely to be much smaller in size, probably using a mixture of static models or simpler moving figures ala Little Mermaid (not actual animatronics). The only animatronics are likely to be a half dozen (if we're lucky) figures combined of Tiana, Naveen and possibly Mama Odie. Louis might be reskinned from a Brer Bear frame or something. If Facilier appears in any form, it almost certainly won't be an AA but a basic shadow projection. Incidentally, one hopes they don't go for facial projections for the humans. This effect rarely looks good and more often than not is awkward and poorly executed. It'll be even more of a challenge for characters with darker skin tones.