Sigma has announced (DPReview's Photokina 2018 news
) it will release a full frame Foveon sensor model in 2019 in the new Leica-Panasonic-Sigma L-mount (discussed elsewhere in this thread
). Native Sigma L-mount lenses (as yet unspecified) will be released at the same time.
Sigma will also produce a Canon EF to L-mount adapter.
Looks like the wishes of quite a few on this Forum are about to be granted - Leica lenses on a full frame Foveon sensor.
Edit: from the same article, "Sigma CEO Kazuto Yamaki... said the company would not create any more cameras using its proprietary SA mount. However, existing SA-mount users will not be left out in the cold: the company will be able to convert some SA mount lenses to L mount. Those who want to retain SA compatibility will alternatively be able to use an SA-L mount adapter."