Sorry to burst everyone's bubble but this is hot air that the PAF is blowing up the nation's behind.
Some facts:
1. The JF17 facilities at Kamra (AMF) are about to go dormant and the PAF is in a great panic to figure out something to do with them.
2. The PAF approached Turkish Aerospace for potential JF17 upgrade but the Turks rightly countered what about IP and dealing with China because you cant go about messing with JF17 in secret to which the PAFs reply was "don't worry sar!" and nothing. So this discussion went nowhere.
3. Turkish Aerospace has tried several times to rope in PAC into Kaan but PAC has failed to do so because of their utter incompetence and laziness and the desire to prop up NASTP and put it between everything.
4. PAF has a habit of lying and bragging. I know of several examples where things were shown at NASTP that were literally stolen slides from Turkish Aerospace. I won't go into details. But the point is that PAF likes to pretend it's collaborating MUCH more than it really is.
Considering these facts, if I had to guess what PFX is? It's some AVM's brainfart of an idea to keep the JF17 line running with something with the plan to figure something out along the way. Nothing more. There is no collaboration with Turkey. They don't want any part of someone's current brainfart that will be replaced by a totally different brainfart in a few months. Sounds like usual false bravado and grand plans and an official version of "he's my best friend" when he doesn't even want to acknowledge your existence.