Thank goodness. Not only is KFP not a funny (or appetizing) concept for a theme park restaurant, but to be honest, I never remembered seeing it on the show.
Aside from Krustyburger, there are only 2 restaurants that are iconic enough to be featured in mini Springfield and that the general public would "get:" the Frying Dutchman and Luigi's. IFF used to serve Italian, so the kitchen is already configured for pasta and pizza, so I'm leaning towards that. The problem is, it would sound too much like Louie's, so who knows.