Part of me wants them to revisit The Beasts queue, it's really in need of some work. The vending machine placement always gets me.
The majority of the times I went to Kings Island this past season, the standby line was usually always, if not about to, overflow into the midway, it just needs more queue! The whole "back row" queue on the station platform has long since been unused. Not to mention how weird the Fast Lane Plus queue is for the ride, it's one of the few coasters that have a really weirdly setup Fast Lane. Bat just has none at all, given where it's placed off of the ground.
The main thing I guess I'd be interested in seeing is an expanding standby line, whether the overflow goes back behind the entrance building or use the space inside of it, and a better dedicated Fast Lane entrance, so I don't have to squeeze past people leaving the ride in the tight exit walkway.