I must admit I am somewhat surprised by the news of further 054A units myself, I do however agree that it is likely they will move towards a larger gas turbine design, possibly with an AESA radar derived from the 052C technology.
Hey, just to get back to your question about msa ship. I posted on my blog on this, but the basic gist is HP is building a bunch of cutters for one of the two major Maritime agencies in China. It's part of their general MSA build up in south china sea.