Lockhart will not be in future books, according to JKR. Dumbledore is going to die, for there has been confirmation from several bookmakers that numerous £50 bets have been placed on Dumbledore dying. This is in the town in which the book is being printed, hence the bookmaker officials stated that it is obvious that a leak has occured. Poor Dumbledore.
i dont want anyone to die. but if someone does die...i think it will be ron.. the description said an important character will die...and look at all the clues. first of all when harry and ron and the staff sat down for christmas dinner, professor trelawny said there were thirteen sitting down so the first one to get up was the first one to die and harry and ron both got up at the same time. but it cant be harry because its only the 6th book and the series is named after him. second is not noticable as a clue but it is. ms weasley sees her family one by one dead. its not much but i still think that its a little clue.and ron was made prefect so if he diesharry would become head boy. which in the end would make a good ending. thats all i got so far but im looking into it