Sigma has unveiled an all-new 105mm F2.8 macro lens, which will provide 1:1 reproduction and will be offered for E-mount and L-mount mirrorless cameras. It features a new optical formula comprising 17 elements in 12 groups, including one SLD (Special Low Dispersion) element.

The 105mm F2.8 DG DN Macro features a 14cm (5.5″) working distance, an aperture ring that functions either clicked or de-clicked, and a three-zone focus limiting switch.
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https://www.dpreview.com/news/9821386679/sigma-105mm-f2-8-dg-dn-macro-for-e-and-l-mount-arrives-in-october