EnigmaticClarity
Studious
They also haven't been designing new figures using double jointed limbs for quite some time now. That only shows up with limb reuse. They would have to retool these parts to be pinless. But if they were going to retool them anyway, they'd just redesign them with the current single joints.
This is also my understanding. The story I've heard for years now is whoever Hasbro's contact at LucasFilm is prefers single joints, and any double joints we see are sculpts that are 4+ years old. So if we do see pinless double-jointed knees I'll be surprised.
They supposedly had the same LucasFilm person as their contact for the recent Indiana Jones line, and all of those figures certainly do have single-jointed knees and elbows.