Here is what we can tell you.
If there's one thing that might hold back the JH-XX's development, it's the new plane's engine, just as problems integrating a Chinese-built engine reportedly have slowed development of the J-20 and FC-31 fighters.
The Chinese air force is expanding its fleet of J-20 radar-evading stealth fighters while also preparing to field FC-31 stealth fighters and H-20 long-range stealth bombers, the U.S. Defense Department warned in the 2019 edition of its annual report on Chinese military developments.
(This first appeared earlier in the month.)
China's stealth expansion isn't without hiccups, as Beijing's engineers still struggle with certain key technologies. But the Pentagon doesn't expect technological challenges to halt the Chinese air force's transformation into a stealthy, "fifth-generation" force.
Modernizing the People's Liberation Army Air Force, or PLAAF, is a top priority of Chinese military leaders. "The PLAAF, in particular, has received repeated calls from its leadership to become a truly 'strategic' air force, able to project power at long distances and support Chinese national interests wherever they extend," the Pentagon reported.