Hi, @mickee 
When you mention "an announcement of sorts" in that "apt upgrade" window screenshot of yours, I assume you're referring to the following block of text in your screenshot:
# News about significant security updates, features and services will
# appear here to raise awareness and perhaps tease /r/Linux
# Use 'pro config set apt_news=false' to hide this and future APT news
In case you don't already know, "/r/Linux" is the Linux "subrredit" in Reddit: https://www.reddit.com/r/linux/
I remember that specific message you've mentioned was discussed in the following Reddit topic (started on 30th October 2022) in that "/r/Linux" subreddit:
https://www.reddit.com/r/linux/comments/yh6xwc/ubuntu_devs_tease_rlinux_via_apt_news_of_the_day/
I think this particular "teasing" message in "apt" output is related to the negative reaction that some users had to previous (but recent) "ads"/ "advertisements" in the output of "apt" commands promoting the "Ubuntu PRO" (beta) subscription service - https://ubuntu.com/pro - as discussed, for instance, in the following "OMG! Ubuntu!" article (published on 13th October 2022):
Interestingly, I've found there's already an open issue / bug about this "Ubuntu PRO" integration with "apt":