[Hm... there's a lot he could tell you, and given that you don't have as much Darkness in you as he remembers... man. You are young. Anything he tells you would be a major spoiler, wouldn't it?] How much do you want to find out?

[Best to play this by ear. If he wants to know about Castle Oblivion, he's probably the best source of information you can get since Sora forgets it all, that idiot.]