How will systems running the beta SW, be updated when the public release is available,
The update will be automatic, and there will be no need to factory reset.
will they then automatically be a part of 3.x beta SW
If you have received the beta through me, I hope you will remain on the beta track. However, if you ask to be returned to the public release track, this is a simple procedure and does not require a factory reset. I will remove your serials from receiving beta releases, and then when the next public release happens, you get on that track and stay there.
Everyone that has accessed it through a dealer should talk to their dealer about wanting to continue or not.