It is now confirmed by Sony Japan that a major Sony announcement will be held on January 26, 2021.  The company released a teaser for a new Alpha with the title  “The one never seen”. This is highly likely that we’ll see the Sony a9 III 8K mirrorless camera on January 26, 2021.
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https://www.dailycameranews.com/2021/01/major-sony-announcement-on-january-26-2021-new-8k-a9-camera/