My lazy prediction of what a Type 052E might be, assuming this line may still continue.
Much like the Type 052D with a few changes.
Type 346B radar with GaN.
GaN X Band APAR on integrated mast, like possibly on Type 055, or offered in "Type 057" (export frigate in IDES 2016), which I assume to be one and the same. This radar replaces the Type 364, Type 366 and Type 344 radars, the three current mechanical radars on the Type 052D and other PLAN ships.
Type 517 Knife Rest gone. Replaced with ECM mast.
IEP and increased electrical power generation.
The concept is to leverage off as much of the existing Type 052D design and use components from the Type 055 to reduce costs, strengthen standardization and current manufacturing.