Canadian newspaper The Province has compiled a bunch of news about Harry Potter and the Prisoner of Azkaban, talking about the changes Cuarón has made (new clothes), special effects (Quidditch), Michael Gambon as Dumbledore, and comments from Gary Oldman, Daniel Radcliffe and Emma Watson:
Radcliffe ... says that Azkaban's Quidditch game will be "more impressive. There will be amazing special effects."
"I'm sure it wasn't easy to succeed someone that competent," Emma Watson [says of Michael Gambon, replacement for Richard Harris in the role of Dumbledore]. "But he's perfect and he doesn't try to copy Richard. He's doing some changes and the part becomes his own."
Of the young cast, Cuarón told Variety, "I think they're excited about me directing." Cuarón's influence led to the characters wearing more modern clothing.
The not-wearing-robes issue sparked controversy among fans last month after set photos appeared in Newsweek. While robes are bound to make an appearance (especially in classrooms), expect to see Hermione's new rainbow belt and hooded sweatshirt in the movie.