I don't know, guys, what kind of "hints" you’ve spotted in the last book or why some fans are so thrilled with the irrelevant "revelation" (does it really matter?). All these belated "revelations", while adding absolutely nothing, create a silly controversy that reeks of a publicity stunt. Rowling will be milking Harry Potter forever. Now she is planning to write her "Harry Potter Encyclopedia" which would include some “new material”.
You may rest assured that there will be all kinds of revelations about Dumbledore’s past and Snape’s heroic exploits, to give the omnivorous fans something to chew on.
Meanwhile, the authoress filed a lawsuit against RDR Books, a small publisher in Michigan. The suit claims that "RDR Books will infringe on Rowling's intellectual property rights if it goes ahead with its plan to publish the 400-page "Harry Potter Lexicon" on Nov. 28."
"I cannot, therefore, approve of 'companion books' or 'encyclopedias' that seek to pre-empt my definitive Potter reference book for their authors' own personal gain," Rowling said in a statement, released by Warner Brothers.
It’s all about money.