Yeah, I really don't think that anyone will die and come back.

I believe that, as much as I hate, Ron will die. He is Harry's best friend and it will make it extra hard for Harry to go on with out his friends, parents, and Dumbledore.
But he will, he will make it.

I don't know who the other person may be, but I do have some ideas. Maybe, Hagrid or Professor Lupin or soon to be Head Mistress McGonagol.