PLA Air Force begin to equip with J-10B, the upgraded version of J-10 and J-10A fighters designed by Chengdu Aircraft Industry Corporation, Moscow's Russian News Agency reported on Oct. 16. The J-10B fighter is equipped with active electronically scanned array radar (AESA), which its prodecessors do not. It also has new generation avionics, a diverterless supersonic inlet and an infra-red search and track sensor. On the new model, the vertical stabiliser and wings of the fighter are also modified. 
10 J-10B fighters with serial numbers 101, 102, 103, 104, 106, 107, 110, 120, 122, 201 have already been revealed on the internet.

Some of the J-10B figthers have been equiped with the modified version of Shenyang Liming Aircraft Engine Company's WS-10B engine. Rumors indicated that the Russian-built AL-31FN-M1 engines can be supplied to the PLA Air Force for the J-10B. It is an upgraded version of the AL-31F currently equipped in use on J-10 fighters. Full production of the new fighter had started with the first J-10B appearing on production line in July of 2013.

Production issue is in engine. The crystal blade requirement is indeed difficult to meet production level, but has improvement.
they are able to produce 2nd and up to 3rd generation blades.

From the patent below, it appears they may currently be working on 4th gen blades.

"Fourth-generation single-crystal high temperature alloy with high strength and stable structure and preparation method".
  there of CN 103382536 A

 The invention relates to the field of high-strength single-crystal high temperature alloys and especially provides a fourth-generation single-crystal high temperature alloy with high strength and a stable structure and a preparation method thereof. The alloy is mainly applicable to aero-engine blade materials used at a temperature higher than 1100 DEG C. Chemical components of the alloy comprise, by weight, 3 to 5% of Cr, 5 to 12% of Co, 6 to 8% of W, 0.1 to 2% of Mo, 4.5 to 6% of Re, 2 to 4% of Ru, 5.5 to 6.5% of Al and 6 to 10% of Ta, with the balance being Ni. The preparation method comprises the following steps: preparing a single-crystal blade or test rod under the conditions that temperature gradient of a single crystal growth furnace is in a range of 40 K/cm to 80 K/cm, casting temperature is 1480 to 1550 DEG C, shuttering temperature is consistent with the casting temperature and a growth rate is 4 to 8 mm/min; and then carrying out solid solution homogenization treatment, high temperature aging treatment and low temperature aging treatment so as to allow the alloy provided by the invention to have high endurance strength. The alloy has a life of no less than 100 h in endurance conditions of a temperature of 1140 DEG C and a pressure of 137 MPa and has endurance strength equivalent to the endurance strength of an EPM102 alloy; and the alloy has the advantages of good structure stability at a high temperature, a wide heat treatment window and easily controllable solid solution treatment."


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