They're not -- it's going to crash and burn as bad a Harry/Cho. Look for Ron/Luna and Harry/Hermione (or possibly Harry/Ginny -- especially if the rumor is true and it's Hermione that dies) as the romantic pairings.
Nah, I think it's going to be Ron/Hermione. JK Rowling has said that "you should know who will end up with whom" in reference to Harry/Hermione versus Ron/Hermione. And Ron/Luna is just too weird for words.
I think it's adult characters who are going to die. Lupin's doomed. He's been doomed ever since Pettigrew got his shiny silver hand. Dumbledore might die, though at this point I'm kind of rooting for that, stupid manipulative git. Snape's likely to die heroically, redeeming all his past sins. Hagrid might make it.
Oh, and either Neville or Ginny will die. Probably Neville, since he's become v. cool in OotP. If not, they end up together.
I doubt a Harry/Hermione scenario. I have heard that J.K. Rowling even considers that a brother/sister type of relationship.
I've been expecting Harry/Ginny eventually... that would cement his relationship with the Weasley family, wouldn't it? :-)