When they first announced the retheme, it was being done on the extreme cheap. It had a sub $40 million budget, pretty much all of the AA's gone (apart from maybe a dozen or so new ones, probably face projection ala Frozen ever after). Empty rooms with video projections on the walls. That was an entirely different concept, the "Lost Trumpet" version I believe Jim Hill discussed.
Things changed drastically after the announcement did not receive the praise they thought it would have. It reportedly scared them enough that they went back to the drawing board and created a whole new more elaborate ride experience. While I wasn't given a figure, i'm told the current budget is quite significant. The infrastructure installation alone was listed as $40 million on a recent permit (the figure originally floated for the earlier variant in its entirety), that's not including any of the actual setpieces, figures, music etc. Just the foundational stuff before any show scenes are installed.
From what I understand, Disney has sort of given up on doing this attraction on the cheap and are actually making an attempt to actually create something on the level of Splash. This seemingly includes not skimping on the AA's. I was even told they will have actual faces, not face projection. I don't know the exact quantity it will contain, but I was told that it shouldn't disappoint in this regard.
If the artwork of the critter band released late last year is any indication of what to expect of the full ride, there's some decent promise IMO. It's the same scene where the fishing geese and small frogs were originally located right after the first drop, the art actually showcases MORE AA's in that scene than there used to be. There were 8 figures in that scene originally, the art has 11. On top of that, the animals are now all unique. In Splash, there were 5 identical geese (different colored scarfs) and 3 identical frogs. Every figure in the TBA art however is unique. Even the three frogs there are unique distinct designs. What remains to be seen is how closely the final ride sticks with the art.
There's quite a lot of America Sings figures that could very easily be reskinned to work with the designs they've gone with for Tiana. Especially the larger figures. We've seen some fairly similar looking characters in some of the inspirational art released for the ride.
As well as this earlier piece of ride art for Disneyland where you can see a lot of silhouettes of instrument playing critters through background (you can even see the old hanging possums at the top, presumably hold overs from Splash).