I've actually been reading up on the seventh book and I don't believe Harry, Ron, or Hermonie will die. Here's a quote I found that lead me to believe that;
"Asked which five of her characters she would like to invite to dinner, she chose Harry, Hermione and Ron, but then hesitated before choosing her last characters, saying "See... I know who's actually dead", unsure whether she was permitted to invite those who are 'dead'.[32] "
SHe said Harry, Ron and Hermonie before mentioning the factor of people bing dead, so it makes me think none of thosse three will get killed. I think Hagrid dieing is a good guess though.
We are positive Dumbledore is dead.
Rowling clarified that "Dumbledore is definitely dead", when asked by Salman Rushdie and others at Radio City Music Hall in New York City. Rowling answered the same question three times, each time with increasing conviction.[41]. However, on the set of the Order of the Phoenix film, she remarked; "Dumbledore's giving me a lot of trouble". When asked "But isn't he dead?" by Daniel Radcliffe, she explained; "Well, yeah, but it's more complex ... ."[42]
Here check out this site; http://en.wikipedia.org/wiki/Harry_potter_and_the_deathly_hallows
It tells all about it. Isn't wikipedia amzing? Hope this helps.
Watermellon_123