The one who gets the reprieve will be either Snape, Malfoy or Dumbledore. (Don't argue -- that's a different thread.)
The people that will die?
If Snape's really evil, he's dead.
If Voldemort finds out that Snape isn't a double agent, but a super secret reverse triple whammy, he's dead.
If he didn't actually kill Dumbledore after making an Unbreakable Vow, well, he's dead....
Looks like Snape's a goner. That should mean that he lives.
Fred and/or George. One's definitely going to buy the farm. The other will avenge his death.
Neville lives. He has a major score to settle and it'd be a real downer if A) he doesn't get to, or B) he dies shortly afterward. I think more people will be p*ssed if Neville dies than if Harry dies. (Some folks may not like the idea of Harry dying, but they're prepared for it and possibly expecting it.)
Hermione lives. Rowling committing suicide in her final book? Nah. She needs Hermione if she ever wants to do another book in the same realm or setting. Besides, Hermione took the big hit in Book 2.
Ron lives, unless he tells Hermione that he loves her and can't live without her and wants to marry her. In that case, he's a goner. And he might get killed, too.
Ginny. There's an untold(so far) story concerning Ginny. Will she die at the end of it?
Mr or Mrs Weasley: possibly, but I don't think so. Don't know why, but I don't think so.
Percy: dead. Should be dead. Whether it's a wimpy death or a heroic death or a redemptive death, who knows.
One of the "B" characters will go. They're expandable. They may be interesting and are fleshed out, but they're still glorified Red Shirts and not really "major characters". Easy come, easy go.
The Dursleys. They aren't important, so even if they all die, they don't count toward the two.
Nearly Headless Nick: AHH!! Gotcha on that one.
McGonnagal: she's old and uses a cane. Maybe it's her time. On the other hand, she turns into a cat, so maybe she has 9 lives.
Hagrid: could she kill off the big lug? Would he step in and take one for Harry? (Actually, that might be how one of them dies -- defending Harry who has to make it to The Final Battle.)
Those are my opinions (which I probably expressed on the last Potter thread.)
Dumbledore is dead. As a doornail. Like Buckwheat. His picture is in the headmaster's office, so he is out of here.
Why wouldn't he be dead? He certainly did not fear death, especially if it helped Snape keep his cover as a spy.
What if the scar on Harry's head is one of Voldermart's horcruxes. What happens then?