Isn't it clear enough from the hints given that J-20 is being mass produced already? There's no need for a flanker derived, dedicated air superiority fighter when the PLAAF already operate the J-16, improving J-11B to G standard with AESA, and have a handful of Su-35s for limited confrontations and intercepts. J-10C is also a modern air superiority fighter. How many 4th gens does the PLAAF want? For sure the priority will be given to buying J-20s instead of J-11D. J-16s are probably still receiving upgrade development funding just like the J-10 series may be as well.