This newsletter features a section titled Want a Deeper Dive Into a New Mystery? which contains the following:
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Decoding: This is base64 encoded text which reads:
For folks with "a certain set of skills and a lot of curiosity," some of our fans have noticed something mysterious which has been going on for a few months now and they could use your help. More details can be found here: https://wiki.cyphers.75thtrombone.com/i ... 21_Ciphers
In addition, three numeric characters throughout the newsletter were found to link to imgur images.
The first was in the steam link, and was a '2', linking to: https://imgur.com/hocXAC5 a black and white spiral 1876x1876 pixels, showing the word 'JIM' across the middle.

The second was in the firmament link, another '2', linking to: https://imgur.com/BSIo1uN another spiral, this time 1942x1942 pixels, showing the word 'PAUL' across the middle.

The third was one of the characters in the base64 string (a '6') which links to: https://imgur.com/iYCS91J a 1984x1984 pixel spiral, showing the word 'BRUCE' across the middle.

So there's some ongoing talk on the discord about what these could mean. Just thought I'd make a new topic here for similar discussion.