User blog comment:Lovin'Longbottom/Pottermore Update!!/@comment-216.45.164.121-20111102004728/@comment-4476879-20111102005630

Well, it's like the Pottermore Insider post says-- at this point, they no longer have a definite date for that. If I had to make an educated guess, though, I would imagine sometime no later than the end of the year-- anything later than that and they risk the whole thing really losing steam...