Do take into account that the PLA ad on new military aircraft at Zhuhai was made on the exact same day as PLA launched an ICBM for the first time in 44 years, to a distance of 12000 kilometers (enough to reach anywhere in the continental US from mainland China).
I think both were part of the same message. China definitely has a different take on military tensions at the moment. ICBM of 12k range is only for all out war against the US. Maybe it's a response to the US placing Typhon missiles on China's coast/Cuban missiles crisis 2.0, maybe it's a response to unprecedented US arms sales to the rebel regime in Taiwan, maybe it's China taking over the baton of deterance from Russia after the failed Russian missile test.
Whatever the reason, we should take that clear message into consideration when we guess about the level of reveal at Zhuhai.
I'm guessing J20 twin seater or J35 for bare minimum.