Daniel Ahmad, who covers gaming news in China and Asia markets tweeted that Blizzard Entertainment confirmed a booth at ChinaJoy 2020 through July 31-Aug 3.
This Blizzard/ChinaJoy announcement comes right on track as fanfare news for shareholders at the Activision Blizzard Q2 2020 financial results conference call scheduled for August 4.
World of Warcraft: Shadowlands, Overwatch, and Hearthstone are confirmed to be playable at the public ChinaJoy game stations.
It is unknown if Diablo Immortal will be featured there considering we are on the final weeks of mid-2020.
After some hunting, I have found the source. The Blizzard Entertainment (China) website posted their ChinaJoy 2020 participation.
If by any chance you are attenting ChinaJoy, go to the Blizzard Entertainment Booth N3-05.