When you say "*Atleast one character will die", I'm willing to bet it's going to be Ron just like in the first movie except he will die....atleast that's what I think, but if it does happens, it will suck very bad.
At the very least, three people will die at this point. Rowling undoubtedly meant to kill off at least one character, but since then she has announced that another two she never meant to die will die.