We are all speculating/guessing, but my guess is people on version 2022.40.x (and higher) wanting to join FSDb (and have pushed the FSDb request button) should just hold off installing any updates until offered the FSDb software branch. There may not be a merge since there are still cars that won’t be eligible (i.e. - haven’t purchased/subscribed to FSD Capability package, older cars without the required hardware, etc.).
For what it’s worth, FSDb software branch has always lagged behind production AP branch. FSDb branch lagged behind production AP branch even worse/further behind for the YouTuber/hand-selected group before SS.
We have two Model 3s: 2018 LR RWD w FSDb since the first SS 100 group (over a year ago) and a 2022 M3P on production AP. We switch back and forth which car we each drive, so I’m constantly going between “ridiculously fast and fun driving and newest features” and “this feels slow now and is missing newest features and I have to manually open the trunk but it has FSDb so I’m still amazed”. We opted into FSDb queue in the newer one as well, but already updated to 2022.40.4.2. 2022.44.2 has been downloaded and awaiting installation for days. I just ignore it.