Clube do Slugue has posted three images which seems to be a preview of PotterMore:
It seems to be a Social Network with games, fan fictions, etc. Also the possibility to buy the books in e-reader format.
We are not sure for this and we’re awaiting confirmation from Clube do Slugue.
Update: Clube do Slugue said this photo are not real. :(
Update 2: The story behind this images is complicated. Clube do Slugue published this image a year ago, in their investigation about the new trademark PotterMore. Now, they were choosen to publish a coordinate, so they can’t do anything wrong now they are choosen by J.K. Rowling. So, when this images were found, they have to say this are not real, because if not, the very same fan which are participating on this are ruining the surprise. I am not saying this screens are final, but they are some early screens. Of course, they’ll have differences in the final version.