I believe he is referring to this illustration.
Which appears to imply that WS-15 with thrust-vectoring nozzle has been tested on J-10B/C.
Several days ago, the 中南海保镖(A photographer who always stay around Chengdu Aircraft Industry Group) said "Chengdu is great!"
Then, an image poseted by (another photographer).
The sentence means: "Brother's (J-20?) engine is so good."
Credit to : @clarkgap from Pakdef
What I get from this, we will see good news from Chengdu (CAC), but I still cannot conclude anything, maybe related to the new engine (WS-15?)