XJ-10 is a mysterious and newer XJ model. In the episode A Robot For All Seasons, Nora is seen reading the blueprints for her, before hiding them just as Jenny walks in the room. Since XJ-10 is already in development, this may mean Jenny will be replaced and possibly stored away with her sisters after XJ-10's creation. Judging from the blueprints, XJ-10 will have a triangular appearance and claws (and maybe even far more powerful than Jenny)