The new Sigma full-frame mirrorless camera with L-mount will have a 60MP Foveon sensor and is delayed until 2020:
https://photorumors.com/2019/03/01/...60mp-foveon-sensor-and-is-delayed-until-2020/
https://photorumors.com/2019/03/01/...60mp-foveon-sensor-and-is-delayed-until-2020/