I probably gleaned that from a separate blog post of theirs; in the comments, Jason Evangelho replied to a commenter’s concerns (“…I hope it can be made to look as much like the current version as possible…”) with this:
Jason Evangelho wrote on July 13, 2023 at 18:08
You’ll be relieved to know that 115 still mostly defaults to the layout and presentation you’re used to from version 102. It takes a few toggles and changes to get the “Supernova” look. And we did this because we understand some of our users have been used to that general paradigm for the last 20 years.
We also have no plans to retire the “legacy” views, although the defaults may change in the future.
EDIT: Fixed the link, which was not for the blog post I mentioned.