Suit Actor Jun Watanabe who was the Action Director of Kamen Rider Brain, had teased about working on an another Kamen Rider work around the same time as Kamen Rider Brain. Since TV Series' Action Director Takeshi Miyazaki so Jun Watanabe can't be the action director and it won't feel right for referring Kamen Rider Zi-O as 'another work'. So could it be another Kamen Rider Spin-off? This time for miscellaneous first newest Pure Reiwa Rider? or is it for Kamen Rider Zi-O's Summer Movie?
Here is the tweet where he had mentioned the details. He had mentioned that there will be a big announcement for this.