Based on somewhat recent history, I think that if and when the beta appears for 2023.2.x, then x will be a higher number than any of the prior releases on that branch. Right now, most non-FSDb customers are on 2023.2.12. As a guess, this might go to that 25 or. 30 for FSDb, as it did with the holiday update.
I see that there are already early leaked release notes for 2023.6.1, but apparently no reported installations yet. If your primary concern is to be ready for fsdb, you probably should not install 2023.6.x until an FSDb version is confirmed. Unfortunately, things are even murkier than usual during the current pause for NHTSA recall patches.
It's still possible that the second part could happen before the first part of your statement - so to be clear, my advice is don't install 2023.6.x if it appears anytime soon.
Currently on 2023.2.x, and hoping for FSD beta will come so I can subscribe and get on the beta branch. Revisiting your comments and to confirm my understanding, I should not update to the prompted 2023.6.x and wait for FSD beta to come to that branch, then update?
Also, I read something about it, but don't recall the facts--if one subscribes to FSD, gets beta, and let the subscription lapse, will the next update revert to the non-FSD beta branch?
Thanks.