Extremely unlikely that the JF-17 Block III will see any significant structural redesign - at best we might see increased use of composite materials.
Structural changes resulting in increased hard-points and/or wing-loads will be tied to the availability of improved (higher thrust) Russian or Chinese engines.
Realistically, any significant changes will probably occur in aircraft avionics and the integration of new/improved weapons, and that is really where the focus of the JF-17 team should be, given Pakistan's limited resources.