-New Parades (new floats completely)
-New Stage shows
-A New E ticket for DHS, AK, and Epcot
-Connection of the monorail
-DHS needs a major redo
-Animal Kingdom just needs some cleaning up, not much
-Epcot needs to capture the future of today not 20 years ago.
-Downtown Disney just needs to add more stores, restaurants, and entertainment spaces.

IMO theirs much more but some of the main ones.