I got the email today.
It does sound like it's mostly geared toward those who have her AAP. She talks about some new features they're working on (better search functions) and then the new content.
I'm wondering how quickly the different "seasons" will be released. If she's saying Build will come out in the second half of 2023, then she might release the other "seasons" every couple of months, taking us into 2024. That sounds reasonable, although part of me wants them all at once so that I can decide which "season" I'm in.