I think SAC's fifth gen will fill that. But the irony is that plane will be much more of a striker than j-20.
There will be some interesting questions when j-19 comes out and why the stupid Chinese chose the "less maneuverable" design as their next gen airdom fighter
The worst part is it isn't like China isn't letting out any hints regarding the role of the J-20 either. Let us use basic logic.
General Hei weirong said that China's Fifth gen. fighter will enter service between 2017 and 2018 in the famous interview.
In the same interview he also talked about the requirements of true fifth gen fighter (aka the "4S", which includes supermaneuverability).
Dr. Song's paper also mentions that the small aspect ratio wings could achieve higher maneuverablility performances if coupled with canards and a liftbody design. He even the number of 80% increase in lift. Does the description (aside from the chin intakes) deviate from what we see on the J-20 much? Nope.
If China wanted a strike or intercept platform why not go with the FB-22 or JH-7A design? The designers aren't idiots. Control surfaces contribute to the RCS and some how the Chinese came up with a interceptor bomber with a RCS of (as a famous basher put it) "a clean F-16". Those people want to bash this plane so badly that they end up contradicting themselves.