Did you really read it?
First - I am a big HP fan. I did read this post from this so called "hacker".
I caught immediately that this was bogus. Are there no other big HP fans out there?
JKR always give hints to the next book. One of the hints for this last book is that 2 (read it two!) people will die. This post from this supposed "haker" has 3 (three!) people kicking the bucket.
This is how I know that this is completely bogus!
JKR has never lied about the hints that she gives us, I don't see that she is going to change at the last second and on the last book.