I was a little underwhelmed by the Pottermore announcement - until I saw this image! Looks incredible. From what Rowling said, it seemed to me this would just be something along the lines of an RP/Fanfiction site, the only difference with those already found on the internet being bonus features - Rowling's own additions. But look! House points! If this is something closer to a great Hogwarts themed RPG, then I'm super excited!
Let's hope this leaked image is the real deal, and not someone's clever ploy ;)