![Wink ;)](./images/smilies/icon_wink.gif)
JKR doesn't want her fans to be too comfortable with Harry's fate. She wants us to be worried about whether or not he's going to make it through the last book. The fact that so many people take her warnings seriously suggests that she's done her job well.
But that does not change the fact that neither Harry nor Hermione nor Ron will die in this last book. The book will end with Harry and Ginny (and Ron and Hermione) happily married off and starting their adult lives.
She specifically wrote a prophecy that says either/or. One of them has to cop it. Hmmm, I'm betting...the villain! The whole point is that if Harry defeats Voldemort, he can get on with his life.
Most of the deaths in the final book will be bad guys, since none of them have been killed yet (except Quirrell). Bellatrix LeStrange, Peter Pettigrew and Fenrir Greyback are all the sort of nasty characters you can't leave laying around - they have to be killed or finished off in a very final way, because they are nasty on their own, with or without Voldemort in the picture. Lucius Malfoy, Draco Malfoy, and Delores Umbridge have fates that need tying up; death is certainly one option. The Dursleys are about to lose their magical protection and become Death Eater targets.
Still, one of the death scenes she shared with her husband, and it really gutted him, so that suggests some good guy deaths as well. I suspect that we'll see a Weasley not make it. Perhaps one or both of the twins. Other possibilities are teachers, students (Neville or Luna are popular bets) or Order members (Kingsley Shacklebolt, perhaps). I think Hagrid is safe. I think Snape is a good guy, and that he is sooooooo dead. He has nothing left to live for, anyway.
My hypothesis is that romantic relationships will be protection from death - those characters who are paired up are safe, whereas those who are not are doomed. So, Harry/Ginny, Ron/Hermione - safe. Luna and Neville? The bell tolls.... Bill/Fleur, Lupin/Tonks? Safe. Fred, George, Charlie, Kingsley, McGonagall, etc? Less safe. Hagrid's friendship with Madame Maxine counts, while Draco's relationship with Pansy does not. There are bound to be exceptions, but the books do have a "love conquers all" theme, so I thought that this would be an appropriate framework.