There will be a crossover with Is the Order a Rabbit?
Since GochiUsa relies on its setting more, it will take place there, and the girls from KinMoza will visit while on vacation. Karen KUJO is related to the Joestars
Either she is Jotaro's sister, half-sister, or his (potentially distant) cousin, her father being a Kujou. In fact, she might even be very distantly a parallel mirror to Jotaro in a bizarre universe where Holly Joestar would never have to deal with the curse of an awakened Stand.