Assuming the below turns out to be true (and there is currently zero evidence to support it), this is your spoiler warning.
EpicStream is reporting that they heard from an unnamed Star Wars: The Force Awakens actor that a major character from the original trilogy dies. The tidbit involves an overheard scene where he says "I don't know how he will cope without him" which indicates that either Chewbacca or Han Solo dies during the movie. Chewbacca has died once in officially approved novel form but that was retconned out when Disney shuttered the Extended Universe for fear it would confuse new viewers by allowing it to continue for older fans. The more likely candidate is Solo as Harrison Ford has long wanted to have his character die, going back to Return of the Jedi and I would not be the least bit surprised if his Force Awakens contract specifically stipulates that Solo dies so the actor doesn't have to worry about being bugged to return to the next two films of the trilogy. As usual with rumors, time will tell on which turn out to be true.