Thanks for asking on my take on this and in fact I don't know! These blurry and too small images give barely a clue to come to any reasonable conclusion.
Indeed an MLU makes perfect sense, maybe a next step towards integration additional more modern systems and as such improved capabilities. Maybe to attract more customers or even the rumoured WS-13
BUT - and again contrary to what sum spin and fabricate together in their mind - NOTHING hints towards a 4.5Xth or even 5th generation development, nothing hints towards an KF-21-look alike with stealthy features, twin engines and at best two tails! This is all imagination based on hope and enthusiasm, but surely not on facts, since we have only little.
This one is just a regular JF-17 - not even a Batch 3 - and as such only a placeholder:
View attachment 22826
And even this one clearly shows no dramatic changes if ever any?! I has no twin tails, just one engine, no visible stealth features. IMO again just a placeholder or simply again a regular JF-17. But anyway surely NOTHING fancy like some want to portray.
View attachment 22827