The previously reported Sigma full-frame mirrorless camera with L-mount and a Foveon sensor is postponed and will be announced next year (2020) according to a report from DC.Watch - the reason given was a delay with the sensor development. The official camera announcement was initially scheduled for 2019.
The new Sigma full-frame mirrorless camera with L-mount is reported to have a 60MP Foveon sensor (60.9MP to be exact, 3 layers x 20MP Foveon sensor).
Here is the Sigma L-mount lens roadmap:
【速報】シグマのフルサイズカメラ開発が遅れ来年へ。
画素数60.9Mとかレンズ特製が強く求められますね#cpplus2019 pic.twitter.com/CqIvfAJaeK
— notti@今年はイベント沢山行きたい (@nuko009) March 1, 2019