I have very little interest in picking up the book, myself. I have no idea of the spoilers revealed previously from the play were true or not, but regardless I don't consider it canon since the epilogue isn't canon for me.

Yeah, I'm honestly disappointed that after the whole Lexicon lawsuit debacle killed any further plans of her releasing that official encyclopedia, since I remember looking forward to that when she initially pitched the idea. Pottermore was only exciting when it first launched, but now it's just been incredibly meh, imho. Between that and her Twitter, her trying to expand the world or adding on has left much to be desired to me personally, sad to say.