Pottermore sneak peek: An official Harry Potter and the PoA announcement 

We can now officially confirm that you’ll be able to explore this Moment in full for yourself from this Thursday, 20th December, when the first chapters of Harry Potter and the Prisoner of Azkaban will be released on Pottermore.com.
Keywords: pottermore, sneak peek, moment, official, harry potter, prisoner of azkaban, announcement, hagrid's first lesson