I am bit disappointed with fact that J15T meant for EMAILs carrier will still use old Russian engines. I thought that purpose of further purchase of those engines would be for maintaining earlier J15 variants based on CV16 and CV17...
From what I understand, the CATOBAR variant for the J-15 is still under development which you don't want to be doing so with an new engine. I suspect that once the J-15 B/T moves past (not achieve it) from IOC status is when they'll start building J-15B (assuming they'll be calling as such) with a domestic engine.