I believe the reason it's spelled Grille is due to type of food the restaurant serves whereas, Grill is what the food is cooked on.
I'm not by all means a die-hard fan of baseball, but I do love the Reds. I am totally stoked for this restaurant. The menu looks great and looks to be a different dining experience. Kings Island out of all the other Cedar Fair parks has lacked a "Game Day Grille" type restaurant as well as a full service restaurant.