OK, so I went to MK yesterday and I am there a lot, so I ride these same rides over and over again. I noticed some small things being changed in a couple rides for the better. After the drop in pirates with the boats fighting back and forth, they have added more fog and lights near the water canons. So when a "canon" gits the water you see what looks like fire and the water coming up. Looks really neat and a good addition.
In HM, I don't know if this has always been broken for me or an addition. But the place where the guy is trying to get out of the box, they new have some sound effects going like get me out of here, help, etc. I would have noticed this before, it caught my ear right away and was very creepy.