<https://www.canonrumors.com/forum/threads/sigma-will-announce-a-100-400mm-f5-6-3-dg-dn-os-shortly.38665/>
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"It looks like SIGMA is joining in on the announcement fun and will soon be announcing a 100-400mm F5-6.3 DG DN OS for mirrorless cameras. I doubt we’ll see an RF mount announcement with it.\nI’m still trying to find out when SIGMA will announce..."
<https://www.canonrumors.com/forum/threads/sigma-will-announce-a-100-400mm-f5-6-3-dg-dn-os-shortly.38665/#post-836354>