Oddly enough, I had a dream about this the other day. I hadn't read any of the books in a while, nor had I found this site yet. The only thing I can think of that would be responsible for this dream is watching the movie trailer. Anyway, I have a theory on who might die. I think Percy Weasley will be killed. I dont know where this came from, or why, but I have been thinking, and these are the reasons I decided to share my thoughts.
1. He is getting quite high in the ministry, and we all know that Voldemort hates the ministry(no duh!)
2. Second, Something about the letter to Ron in OoTp stood out to me. He mentions that if Ron continues to stay by him, he could be in trouble.
3. I dont think J.K. is ready to just...write him enough like she did. I just think there is something more there.
4. This is purely my thoughts, no facts to support this one- Percy wants to please so bad, he wants power, he wants glory. What better than to help out good ol Voldy? I think he will start helping, and chicken out like Regulus did.
I guess I am worried for Percy. I dont know if he will turn to the dark side, but I am not entirely sure he is on the good side either.