To be honest, I mainly want things, nothing even in particular, but just something that makes me feel HAPPY for my favorite characters. I have no desire to see anything make me sadder than I already am over seeing the series come to a close. I want to end with a big smile on my face. How the show will get there, I don't know, but that's what I want.
Also, I wouldn't expect it since there's no reason to even know beyond satisfying my own curiosity, but I've always wondered how Rainbow Dash's trajectory from flight school dropout to Ponyville went. Between her and Fluttershy, who moved there first and was the other friend's presence a factor into why? That sort of thing.