Here's a wish list of what I would like to see in the future for Kings Island:
Action Zone: Intamin Giga Coaster, Intamin Prefab Wooden Coaster, or Rocky Mountain Construction Wooden Coaster.
Oktoberfest: Intamin Blitz Coaster, or Gerstlauer Infinity Coaster, to replace Adventure Express
Coney Mall: Enterprise, Ferris wheel, or a Chance and Morgan Trabant.
X-Base: Intamin Strata Coaster, B&M Wing Coaster, or a B&M Floor-less Coaster...Definitely add some restrooms tho.
Rivertown, Flying Eagles, a Mack Rides Wild Mouse coaster inside of The old Crypt building, or something like CW The Guardian..
Soak City: ProSlide Water Coaster.
International Street: Antique Cars to take up the Tower Gardens lot.