And speaking of what I know and don't know, I had no idea that the park was also adding two slides to their existing tower. The park tweeted the above image today, revealing the new new slides being added to Coastline Plunge.
While all the slides already cross over each other making things a bit confusing, you can line up the exit of the new slides into the lower pool nicely.
In addition to the new water park expansion, the park is also working on a new 4-D show for the adjacent visitor's center. And update of the goings-on at Hersheypark can be seen here from All America Thrills.