I think you have the right idea, in that Disneyland's Princess Fantasy Faire (the name for their Fairytale Hall concept) is going to be a major indicator of how the similar concept will work in WDW. WDW princess fans will get a big heads up on what they are in for from Disneyland's version opening first this spring.
Disneyland's version is being built from the ground up though, on land that used to be just a large patio and a small berm of fir trees near the Castle. The old bandstand and dance floor is being redone into a princess stage show by day, and then back to big band dancefloor on weekend nights for swing dancing.
Watch This Anaheim Space For WDW's Future! - The Disneyland space in 2011 prior to Faire construction
http://datelinedisneyland.smugmug.com/DisneylandResort/2011/08-21-11/i-khVCCqg/0/L/IMG_9598-L.jpg
Here's the latest construction pics of Princess Fantasy Faire at Disneyland, to give you an idea of the race against the clock they are under to be done by March 10th. I don't think you'll even see the walls down by the time you get to Disneyland in January.
The bandstand being rebuilt near the entrance to the new Faire.
The Faire "skyline" under construction at the back of the space.
http://datelinedisneyland.smugmug.c...hotos/27003054_HHj6Sb#!i=2263966434&k=2rKHz4M
And the finished Fantasy Faire product this spring, per official WDI artwork and models up in Glendale.
http://www./wp-content/uploads/2012/08/fantasy-faire.jpg
http://static.disneylandnews.com/files/2011/08/Fantasy-Faire-visual-color-640x354.jpg
Per Al Lutz in recent Miceage reports, the Fantasy Faire opens at Disneyland around
March 10th, 2013 and there will be three princess greetings per visit, split into two identical halls that parallel each other inside the building. So a visitor would enter and be sent to either side, and then meet three princesses in a series of three rooms, with six princesses working inside the double-hall facility at any one time. The Faire will also have a small gift shop and a snack bar, plus the stage area on the left side of the model for princess stage shows. The existing Bibbity Bobbity Boutique is immediately to the right of this artwork in the Castle itself, and is being reconfigured and remodeled to better integrate with the new princess facility next door.
So in about 90 days when this new offering opens at Disneyland, we'll all have a good idea of how these nearly identical attraction concepts will work at WDW. It sounds like the WDW version won't open until "Late 2013" though, so perhaps not until this same time next year at Magic Kingdom Park.
Oh, and Tiana is my favorite princess too! I like her style, and her taste in music.