I like some of the ideas here regarding differing equipment fits, but I'm not sure you could get an AAW design into a hull much smaller than 052D/E. What would you cut?
If anything I think there could be well a call for an ASW-focused 052 series to provide a long-range, high-performance counterpart to the smaller 054Bs, akin to the Spruance and Knox/Perry combo. Of course the 052 hull may not actually be suitable for a dedicated ASW ship, but something in that general size region.
The larger ASW ships would primarily accompany carriers, amphibs, supply ships, and other high value units on longer deployments. High speed and high endurance. The smaller ASW ships would operate mostly within the first two island chains, or independently on long-range "show the flag" deployments that don't call for high speed transit.
Broadly speaking I don't think people take ASW seriously enough relative to the threat, when even just a few short years from now it will clearly be the predominant threat to China's ability to secure its waters (and protect its HVUs). In the late 1980s USN operated 90 blue water ASW frigates (Knox/Perry) and 30 ASW destroyers (Spruance). China today confronts an undersea threat of similar magnitude and requires a response of similar magnitude. The stuff that other nations around the world are doing today is irrelevant because it is occurring in an entirely different context (i.e. basically an absence of threat and very limited funds resulting in sub-optimal decisions regarding design and fleet structure). One needs to look to the Cold War for guidance.
The future fleet structure for surface combatants had been discussed before at good length; the prospect of a common destroyer or heavy frigate hull for asw and aaw had been discussed as well.
But at this stage it seems like fzgfzy is pretty insistent in his belief that we will see an 054B class as well as an 052E class as well as continuation of the 055 class with a follow on 055A class.
The question IMO now becomes when will they arrive, how many of each will be built, and what exactly each class will look like.