Future World:
1.) They just refurbed SE
2.) They just refurbed TLS:WNAF
3.) They just refurbed TL
4.) MS is still fairly new
None of these will see changes for 10-15 years.
5.) TT -- With GM straddling the fence of ineptitude, unless this attraction gets overhauled completely in theme and nature, or sponsored by a better car company, it won't be changed within the next five years.
6.) WoL should be razed completely and the tombstones of Leave of Legacy tiles should be transported here, out of the way, in a little garden of sorts. This would allow them to resculpt the entrance into something a little more 21st century.
7.) UoE should be gutted completely and re-imagined. I firmly believe they need an entire pavilion dedicated to health and the human body. I know, I know, that's what the WoL pavilion was supposed to be but the structure was like an uninviting convention center. Just put a dark ride in UoE along the lines of "Fantastic Voyage" (I know, just like Body Wars) but I'm talking about a physical, actual ride, not a virtual one.
8.) Imagination! -- I could care less about. Put whatever there.
9.) Innoventions -- I guess that's about the best they could do. Although the version in DL is much more compact, concise and interesting.
World Showcase:
1.) Mexico: Bring back the old ERDT ride. It wasn't out of date or lame. I just went to Mexico and basically saw everything they used to show on that ride, including the lotharios in the pool bar (and no, I wasn't one of them).
2.) Norway: MUST UPDATE THE MAELSTROM. I actually sit through the movie at the end, and the ride could be interesting, but it's a little long in the tooth.
3.) China: It's fine. They just refurbed Nine Dragons and the 360 movie, so it's done for a while.
4.) The Outpost: Grab those plans out of the attic for the Russian pavilion (this is where it was supposed to go) and install it with, perhaps, a rollercoaster-type ride "Trans-Siberian Express" not the folklore, Smallworld ride they intended. WS needs another E-ticket.
5.) Germany: They should add in the dark ride meant to go in the back, but it's not a dealbreaker.
6.) The vacant lot between Germany and Italy: I would place a smaller, narrower pavilion for Ireland in here. It wouldn't have to be a large as the others, but knowing Disney a pavilion-lite version with dining and an attraction of sorts.
7.) Italy: Something, anything. Italy is the most disappointing country of all. There's St. Mark's Square and... that's it. There's nothing there. I would love to see a small Fortress Explorations as in Tokyo DisneySea, one of the greatest non-ride attractions I have ever visited. And it would fit in perfectly.
8.) The American Adventure: Leave it. Though I would like to see the CS serve more regional specialties of the U.S., like a Philly cheesesteak, a lobster roll, gumbo, etc.
9.) Japan: Actually, pretty impressive, large, well-landscaped. Leave it. Some say a Mt. Fuji coaster. I wouldn't argue with that, but I'm not expecting it.
10.) Morocco: My favorite and most thoroughly realized pavilion. Don't touch it.
11.) The vacant lot between Morocco and France: India. So long as they can eliminate the aroma of curry from the TS, there is too much cultural and historical appeal to this country to leave it out. It would be beautiful.
12.) France: It's fine. It is what it is.
13.) England: See France.
14.) The vacant (almost) lot between England and Canada: I know this is some special events setup established for the 2000 celebration. I would very much like to see a Greece pavilion place here. Get rid of what's there now and install a white-washed Mykonos-like town with a dark water ride based on "The Odyssey" or random Greek mythology. A taverna. A bar by the water.
There are so many possibilities.
15.) Canada: Just got a new movie, so that's out. A Brother Bear flume ride would be interesting but no different than Splash Mountain or Kali River Rapids.
So there are my ideas. Rip on them if you will, they are just opinions.