I'm sure it's been mentioned, but I LOVE the change to The Racer! Basically, instead of choosing before entering the que if you are going red or blue, you go to the station and choose a side. The giant wall separating the sides is gone, and while that may sound incredibly minor, it's not, especially if you are going with a group of three or more.
What we did is simple, but so fun - my son and my buddy's son went to the blue racer. My and my buddy went to the red. We lined up so we were in the exact same position, but on different trains. As we went up the hill we were yelling at each other about how we were going to 'win'. The kids were laughing their heads off, and it added so, so much to the ride.
THANK YOU, Kings Island! A very minor modification that made a great ride a lot better!