@ no_name & SinoSoldier !
Yes, it seems indeed to be one of the few - at least for me still mysterious - laws of Chinese aeronautics !
Like I already noted in the J-20 tread, the next opportunity will be between 6. - 11. July (when I'm away with a class) and even more between 27. July and 15. August (family holydays in France !) ... so I think the chances are good that at least until mid-August we know more about J-20 '2016', Y-20 '20004', the operational units of J-10B and J-16 ... and maybe more !
Deino