From the recent news, we can see clearly that J-10, or WS-10a are just transitional goals for PLAAF. The new airplanes are coming from the drawing board(there are other speculations as well), same improvement probably from the engine as well.
I have some doubt that the current configuration of J-10 or WS-10a will go to mass production. The engine, WS-10a needs at least 3-5 years to get mutured for that. The Chinese real goal at least should be the improved version of WS-10a that powers the J-10 Mod version airplane with some kind of stealth feature.
It's quite prudent for them just do small batch production, to solve all the problem encounted for the brand new versions of engine and airplane, not unexpectedly. In 1970s, when China rushed to mass produce the new turbo engines, the problem of broken blade merged from that and forced to ground the whole airplane fleet. They couldn't solve the problem in the short time and the case went up finally to Chinese prime minister, Zhou Enlai. They definitely learned something from that.