Disney posted this video of Tiana's first day at Disney.
It starts with the characters introducing Princess Tiana to the Magic Kingdom. Then there's clips of her new Jubilee show (looks cute, though I wish it wasn't so chopping, but I'm sure I could find the full show online later.) I can't wait to see this in person, though I don't know if I'll get a chance to see the movie before then (it opens while I'm at Disney.) It ends with a short blip of her meet & greet, and then 3 girls getting the Tiana experience at BBB.
http://www.youtube.com/watch?v=vy5iKixM9yc