Time to start conjecturing

We are only about two months away from Harry Potter awesomeness! With that in mind, I've gotta start writing down some Harry Potter thoughts and ideas. I'm restarting the fifth book. It's been so long since I last read it, I really don't remember too much from it.

Questions I can't wait to have answered:

Will Percy fulfill the role as Prodigal Son?

What is Snape doing for the Order of the Phoenix and what role(s) does he have to play in the coming war?

Who is the Half-Blood Prince and does he have something to do with Godric Gryffindor or with the so-called pure bloods?