It was originally obtained by Splash Archive and he shared it with a couple of people in private. Someone he shared it with leaked it in this thread without permission, and it was deleted fairly quickly. Archive asked people who managed to save them not to repost them. I was lucky and saw them before they were taken down.
What was leaked was four screenshot taken from the Disneyland version of the finale with different angles. The environments don't have color or textures yet. just simple blank white geometry. Three of the renders showing closeups of the scenes contain characters. One image has no characters placed at all yet.
There are strands of lightbulbs draped across the flume between the two sides. On the left side of the flume where the Swamp Boys used to be is now some sort of gazebo-looking structure with some thin poles and railings. In the closeup of this structure, Charlotte and Eudora are standing within smiling at guests. Charlotte is wearing the exact same outfit she wore while dancing with Ralphie at the end of the film. Eudora is wearing her usual brownish clothes and is holding a parasol. There's what appears to be a table with a punch bowl in the center of the room behind them. This seems like a fairly large structure, and could easily contain quite a few additional AA figures if they wanted it to. And it does look like a big party scene. Though we'll see.
On the right side where the Riverboat used to be is now a large New Orleans style building facade. There's a bottom level with a porch landing almost right up against the water (where the water wheel was), and an upper level balcony with railing. It's not the same exact design as Tiana's Palace from the movie. There are also two curving staircases on the sides leading up to this balcony, also with their own railings and double landings each. Which is why I'm hoping they use these extra spaces for AA's. The restaurant facade in the film did not contain these extra stairs and landings. In that sense, they took some ideas from the Riverboat. I also noticed that the twisting designs within the metal railings used in both structures form vegetable shapes. In particular, bell peppers.
There are two closeups of the bottom landing. Each shows a set of two AA's. One has Naveen and Ralphie playing their instruments, Ralphie looks like the art they released and Naveen is wearing the same clothes (without the hat) he had at the beginning of the movie. The other set are Tiana and Louis in a t-pose (the default state of 3D models that haven't been posed yet). Tiana is in a long yellow dress with long sleeves that I don't recognize from the film. Louis' joints have gaps in them with rudimentary approximations of AA endoskeleton parts, so the model is probably also being used for building and animating the physical figure. All four of these characters can and probably will end up fitting within this same porch landing.
There are three other characters that aren't in these renders but which I know will appear somewhere in this finale- Naveen's parents and Big Daddy. Hopefully there will be others as well, as Splash had around 26 figures in its finale.