Dumbledore told Harry about the
Horcruxes because he planned his murder. He knew he was going to die, either because he knew the poison in the lake was going to be fatal or because of an injury he suffered. Or, like
Obiwan Kenobi, he would become more powerful and more able to help defeat
Voldemort if he was no longer alive.
James Potter's family has an important role or some link to
Voldemort. He needed to kill him and his son. That's why Voldemort chose Harry and not Neville.
Dumbledore heard the prophecy. Before
Snape could tell
Voldemort and before the Dark Lord could act,
Dumbledore did something to offer Harry protection.
See Goblet notes.
Whence the title: There are many forms of death. Ghosts at Hogwarts.
Voldemort was mostly dead, but even without a body he could survive. As a memory in the diary. Fawkes, the phoenix. The spirits behind the veil in the Department of Mysteries. The people in the
Priori Incantatum. Certainly
Dumbledore's role is not over. Nor have we seen the last of Sirius and the Potters.
Snape has some strong reason to have hated James Potter, and thus Harry. Not just because James teased him in school. There is a connection between families or something happened between them. As
Dumbledore said to Harry, "Some wounds run too deep for healing."
Snape proved to
Dumbledore that he is truly loyal to him. Is
Snape a
horcrux?
Hogwarts itself possesses great magical powers.
Voldemort wanted to go back there to teach but was refused. He is after the
Gryffindor sword in
Dumbledore's office. The final confrontation will involve the school.
The
Dursley's, especially Petunia, will play a key role.
Muggles in general are important as are
Muggle objects. (There is an Office of Misuse of
Muggle Artifacts, where Mr.
Weasley works.) Petunia is going to step in to help her sister's son.
My prediction for the two deaths
JK Rowling has announced:
Mrs. Weasley. She is the closest thing to a mother Harry has ever had.
Snape will sacrifice himself to save Harry.
And in the end, Voldemort will die. Harry will not.
I've read that the last word in the book is 'scar'. Harry's scar will disappear when Voldemort is dead.