I think I forgot to mention this before, but I seem to remember that at least one side of PK's failed water tunnel has been completely removed. I guess this means they've given up on getting that to work. I seem to remember there being some issue with moisture affecting the sensors.
I also noticed a lot of new thematic signage and such in various places, like TNT's tunnel. Some of it may have been from the last couple of years, but I'm sure some of it is brand new, and some of it really blends in well with the rest of the park. I was glad to see that they still have some of the old touch. Can't remember any specific examples though.