The magic is coming back!!

Harry potter..more than half the kids in the world would have heard,read, watched this character and the magical world, this character and his friends live in!!
Uptil now, as most of you know, a series of six most wonderful books have come out (thanks to the author, you know who)....now, the buzz about the seventh book has started!!
The buzz about who will die in the seventh book? will Harry conquer voldemort?
Or, will Harry die try killing voldemort?(that would be a very sad ending for such a wonderful series)..newayz..we wudn't know JK Rowling has up her sleeve until the next buk is released...
next buk??isn't it the last buk?..speculations abt the eight buk are also doing rounds on websites..but JK Rowling supposedly confirmed, the seventh buk wud be the last one in the series...
the buzz, intensified, when JK Rowling was tried to stop carrying the draft of the seventh book from carryin in a flight from america to england...
but, the authorities had to give in and allowed her to carry the book along with her..gud news for everybody..that nothing frm the buk leaked out..
and now the buzz increased again.
and guess what!!, the name of the book is out!!
supposedly, its the "Harry Potter and the Deathly Hallows".
now i've read all the six books twice.. i've had a couple of questions..will JK Rowling answer them in the seventh book?
my questions:

Why did Dumbledore smile when he learnt that Voldemort had used Harry's blood to regain his body ?

Who is R A B? Is he Dumbledore's brother?

Who is snape? What are his intentions?

Did Dumbledore actually die?

wait and see!