To be honest, I think the J10B might be the last major modification of the J10.
The days of endless incremental improvements on existing designs is in the past for the Chinese, or CAC at least. If anything, I think CAC has too many exciting, entirely new projects going on right now, which is almost certainly a big part of the reason why it took so long for the J10B to start production.
Why would CAC want to divert finite and highly in demand resources to develop another J10 variant, which even the most radical and successful of which would only ever make the J10 a 4.5 gen fighter when CAC could be working on a brand new 5th gen design instead?
There is really no real incentive for CAC to invest heavily to further develop the J10 since they pretty much have the Chinese market cornered as there is no real competitor for the medium weight sub 5th gen market. Internationally, the J10 isn't really for sale, Pakistan may get some, but I think that may be it. Many high ranking officials from several air forces have very publically expressed an interest in the J10, but they were only ever met with polite silence by the Chinese side.
To be honest, that's pretty much always been the deal for Chinese fighter makes, if you corner the PLAAF market, that is your only business and the plane is just not available for export. It was the case with the J8, it looks like the case with the J10, and will almost certainly be the case with the J20.
That is pretty much the entire reason for the genesis of the FC1 which became the JF17. CAC partnered up with Pakistan and fronted a huge pile of money from its own pocket to develop the JF17 when it already had the very capable and successful J10. In any other country for any other company, they would have just offered the Pakistanis a version of the J10 instead of designing a brand new fighter from scratch.
In a way, for Chinese aircraft makes, foreign sales is almost like a bogy prize as you only get a nod to market a plane internationally if the PLAAF doesn't think highly enough of it to want to keep it for themselves.
If I was in charge of CAC, I would focus my resources on UCAVs and a medium weight naval 5th gen to compete with SAC for the PLANAF future carrier aviation contracts, as I expect the PLAN to ultimately field 4-6 supercarriers within a decade or two, and those carriers would need a lot of planes and represent the future of the Chinese military aviation market in terms of pure growth potential as the PLAAF modernisation would largely be complete by that time frame, and would likely remain so for some time barring extreme unforeseen events.