We've heard several sources saying there will be a lot of animatronics. And not just from me or their PR statements. I'm confident it'll have far more than the likes of Rise of the Resistance, Frozen or even Tokyo's Beauty and the Beast.
However, by what standard is "a lot"? Beauty and the Beast has about 17-18 proper AA's. Frozen has 15. That's actually considered "a lot" by modern Disney standards, when more often you'll see numbers in the low single digits. Splash at WDW however had approximately 55+ proper AA's. And Splash at Disneyland had 76-78.
So in the context of Tiana, are they aiming for Splash Mountain quantities, Frozen/BATB or something in between? The PR statement said "dozens". So i'll assume it'll have at least 24, which is relatively more than anything else they've built in the past few decades. Another person on this forum a while back said it would have have "over four dozen" new animatronics, around half of which would be state of the art. That's much higher at 48 figures, quite a lot by modern standards. Though still perhaps still not quite as many as WDW's Splash, and a lot less than DL's Splash.
There's also a rumor, stated by two different people, that the Riverboat finale would be gutted and replaced by a projection mapped facade of Tiana's Palace restaurant. With all of the old animatronics being scrapped. One of the two people said that this scene would only have 6 animatronics, a reduction from the 26 that Disneyland's Splash has or the 18 that WDW has. That's kind of a devastating loss if true. This source has yet to release the renders they said they were going to upload. Though given that this claim has been reiterated by another seemingly separate individual a while back, there's a decent chance it's true. Disappointing if so.