A photographed copy, and yes there are two different copies circulating over; both of which have minor discrepancies over their plot. So which of which was real? A reader could never tell unless the real book was released tomorrow. So far, all were speculations that the one was fake and the other was genuine, or vice versa.
How come there was a leak of the photographed book, though its tight security measures? Simple, because according to the news some retailers in the US had breached the strict rules and delivered the books early as expected, hence the the said leak occurred.
Which was the genuine book? Although, Scholastic and J.K. Rowling had not spilled anything on the authenticity of the leak, a popular journal in the US broke the never ending saga of the debate. According to the New York Times
... it turns out that they were, in fact, the genuine article. The New York Times bought a copy of the book in a New York store on Wednesday and compared it with the images posted on the Web.
The amateurish photos showed each pair of facing pages of the book laid out on a beige red-and-green-flecked looped carpet and held open by somebody’s fingers. Some of the photos made the pages difficult to read, but the ending, upon which fervent speculation has centered for months, was completely decipherable.
Hence, now spoilers are everywhere...