Seems Sigma have been busy and released the following
Sigma 85mm F1.4 DG HSM Art
Sigma 12-24mm F4 DG HSM Art
Sigma 500mm F4 Sport
https://www.dpreview.com/news/5823614167/sigma-adds-lenses-to-its-global-vision-line
https://www.dpreview.com/news/4375319680/hands-on-with-sigma-s-latest-lenses
That 12-24mm sure looks nice and seems like it will be way less than the Canon 11-24mm F/4.0 L USM
Sigma 85mm F1.4 DG HSM Art
Sigma 12-24mm F4 DG HSM Art
Sigma 500mm F4 Sport
https://www.dpreview.com/news/5823614167/sigma-adds-lenses-to-its-global-vision-line
https://www.dpreview.com/news/4375319680/hands-on-with-sigma-s-latest-lenses
That 12-24mm sure looks nice and seems like it will be way less than the Canon 11-24mm F/4.0 L USM