The name of the next Harry Potter book was revealed this week:
Harry Potter and the Deathly Hallows. J.K. Rowling revealed it through a fun little puzzle on her web site,
jkrowling.com. (I always read the little cheat sheets floating around the 'net; I can't imagine how actual kids figure out the complex games she sets up.)
So what does the name mean? Like most of her previous books, nobody knows. Most of the HP titles refer to new themes that haven't been introduced before, and that's the case here. I'm going to hazard my own guess though. "Hallows" can mean holy ones, as in All
Hallow's Eve (aka The Eve of All Saints, aka Halloween). I think the Deathly Hallows are the spirits of Harry's family and friends who have died, and they will have a role to play in helping Harry defeat
Voldemort. Another clue is from Order of the Phoenix, when Harry heard whispering "behind the veil" in the Department of Mysteries. The veil symbolized death. My hypothesis is the people whispering were those who have died.
Now I don't think it will be like Obi Wan
Kenobi in
Return of the Jedi, where they come back as regular characters, just,
y'know, dead. I think they will be more like friendly spirits, the way Harry's parents appear as part of the Phoenix Effect at the end of
HP and the Goblet of Fire.
If I remember correctly,
JRK said we hadn't seen the last of Sirius, so that fits in well with my theory, too. I'll see if I can dig up the reference.
I realize this doesn't make much sense unless you've read the books. But so many people have, and in fact one of my favorite things about the books is that they have created a huge reading community. HP lovers unite!
UPDATE: Check the comments for JKR's hints on Sirius and future books.