Okay, I'll just come out and say it. Han isn't dead. The lightsaber cauterizes wounds. Chewie vanished after Han fell, he went to get him. You then see Chewie bringing someone to the falcon and everyone assumes it's Finn, but it could have been Han as well. After that you hear someone say that he's still alive. They never said its Finn, but we assume it's Finn. Also no one confirmed that Han was dead. Luke survived his fall in Empire, and yes Darth Maul did survive getting chopped in half and falling in episode 1 (See the clone wars cartoon series, it's pretty wicked). Most of all, Harrison Ford signed up for episodes 8 and 9, and Star Wars doesn't do flashbacks.