This was revealed on a New Years Stream:
“Well, honestly I think this might be the most costly development project in Bandai Namco history,” Harada said. “I think its incredible that the higher-ups approved of this. Well, the approval has passed, its just that due to the coronavirus, we haven’t really been able to properly start the project."
"I’m developing things other than fighting games. I don’t think I’ll ever do any other fighting game other than Tekken. But I won’t say what this project is at this point.”