Tomorrowland - Astro Orbiter - I'd just change the elevator to something much faster and more efficient loading. That's a great ride that gets passed over because of its horrible queue and loading process
Fantasyland - Peter Pan - I'd update the queue here too.....soooooo boring. Honestly though, the upcoming Princess meet and greet? I know it's not open yet but more princesses? Really? I'd change it to a more unisex-focused meet and greet (Peter Pan, Hook, and Smee maybe?) or put in a new ride. There's way too much girl- and princess-focused stuff already.
Liberty Square - No refurbs here for me.....love it all. If I could add anything, I'd add in something like Voices of Liberty at Epcot.
Frontierland - Country Bears - Just to have something to refurb, I'd say this one. It's not one we normally do but the others are good now.
Adventureland - Jungle Cruise - my only change would be to somehow change the dock where loading and unloading would go faster. Maybe a walkway over the canal where you could load on one side and unload on the other? And I'd make the process of becoming and staying a JC captain much more stringent. No more just OK captains! You're not funny or not into it? You have a new job waiting for folks to show up for Stitch.
Main Street - Casey's - expand the seating somehow and bring back the old hot dog buns!!
For what attraction(s) would it really really worry you if you heard they were getting a big refurb?