Sony has registered a new camera in China under the model WW559681 - could this be the rumored a9III? The 5.1G (MHz) frequency indicates a high-end model. For reference:
Sony ZV-E1 registered on December 12, released on March 29 (three and a half months)
Sony ZV-1II registered on February 2, released on May 23 (three and a half months)
Sony A6700 registered It was released on February 16th and July 12th (four months)
Sony A7cII and A7cR were registered on June 12th and released on August 29th (two and a half months)