Two things that I noticed this weekend on the Wonder that were welcomed changes (since we were on it in 2012) were the stateroom doors and Shutters. They changed Shutters to use the Book system used on all the other ships. That is so much easier than having all the pictures displayed on the walls.
They also changed out all the door locks to the touchpad. This is so much easier than having to remove your KTTW card from the lanyard every time you go to your room.
I guess these are pretty minor since I don't think I have seen them mentioned much but I appreciated those two things