I had already seen enough changes at Worlds of Fun late last season to know the work they were doing was above and beyond anything usual. As I mentioned before, they started this makeover during last season, so it was clear this was a big project. This year is Worlds of Fun's 50th anniversary, so I imagine that played a part in the decision to put more theming and details back into Worlds of Fun. And after going to the park regularly (and that is an understatement) since 1979, I can tell you the work they have done (and is still in progress) is making Worlds of Fun look the best it has since probably the 1980's.
A significant amount of work has been done in painting most of the park's buildings and the majority of them have new color schemes. They have also been adding additional details to structures with painted patterns and designs, painted signage on some structures (on sides of buildings and in addition to main signs), and some architectural embellishments as well. And signage is a huge part of the makeover with many shops, rides and even restrooms getting all new signage. Some signs haven't been put up yet, so it would make sense those will be new as well.
You mentioned "a few painted railings" in your comment. WOF did one better and has painted more fencing in the park than has ever been painted. In fact, most of the wooden fences in the park were never painted, but they are now.
And thank heavens, the Coasters diner in Africa which never should have been, is now getting a bit of a makeover to be the Sand Dune Diner. They even added palms to the landscaping this past week and near Mamba.
On top of all that, the new Zambezi Zinger will hopefully be opening sooner than later. But at least for me, the work they have done to the park is so nice it's like seeing Worlds of Fun more like it was back in its glory days.
I don't have many pictures of the new looks around the park, etc. but I will share a few and try to get more as they wrap up the work.