I think the 4th picture looks like an 052C, the bow of the ship on the side has the sort of "crescent" shape distinctive to the class.
Impressive, if there are indeed those 4 extra 052Cs (well, two extra ships, seeing as one has obviously come out, while the other is just a few months behind) to make up a grand total of 6 it would be a major boost if not a near revolution for PLAN air defence. The increased quantity would allow these assets to be transferred to make up part of a CVBG along with 054As and varying SSNs.
Well the chinese shipbuilding industry is 2nd in the world or something (maybe 1st this year supposedly) -- so quality control shouldn't be a big deal. It's not like all the construction is being handled by a lone shipyard either.4 extra 052Cs ! ... at the same time .. it is really impressive plus a few 054A, and 071, subs, etc, etc ..... I wonder whether they can control the quality of all of them (many) to the highest standard ?
The first Arleigh Burke DDG, the USS Arleigh Burke, DDG-51, was commissioned for service on July 4th 1991. The latest Arleigh Burke, a Flight II A (meaning she has the two helo hangar and latest greatest upgrades, etc.) is the USS Spruance, DDG-111, launched in June of this year, 2010. With the significant upgrades and changes, some even call the Flight IIA a different class, the Oscar Austin Class...but that is not official. There are 33 of the Flight IIAs, and plans call for at least ten more.Just for comparison, US Navy comissioned 29 new Burke class destroyers in the last 10 years. That being said, I belive it's better for PLAN to go slow, not to mention it'd be dangerous for the whole economy to try to match usn comissioning rates at this moment.