Disclaimer: This is not my words, only short/rough translation of what fzgfzy say in CJDBY.
Regarding 054B:
1. It was called 057 at first but changed to 054B. because certain someone think is not possible at this time and probably needs a few more year. (My guess is some new system not ready?)
2. Electric, but not pure Electric. Better/stronger ASW function than current 054A. ( My guess is
?)
3. No shield and look identical to the newest variant of 054A from the outside, no need for shield as there are too many shields already. Cost less money and faster. (This means no Type-45 DDG style integrated mast?)
4. Pretty much same tonnage as 054A but with newest weapons and electronic.
5. Won't start until the end of 2016 the earliest. Might buid at the same time as the last few 054A.
6. Eight more 054A or being ordered( 24+8=32 054A then?)
Link to the 054B post.