Mac OS X Public Beta is for testing purposes. That's an issue that's been well drilled into our heads in any discussion of Mac OS X since the first release of Rhapsody.
My guess is that Apple's release of the final version of Mac OS X will have an "updater" to updgrade only:
1. Mac OS 8.6 - 9
2. Mac OS X Server
3. Mac OS X Public Beta (from an "unhacked" state)
If the final release is too late in coming, Apple will patch to automatically extend the "cut off" date for three months or so. They've done this before with other software (MRJ public previews, an OpenDoc beta if I recall right, and I'm sure others). It'll be worked in to the auto-update feature or be a trivial download.
If all else fails, they'll simply remind you that Mac OS X Public Beta was for testing purposes only and that it's your responsibility not to be "burned". That's would be a PR nightmare, but legally they don't HAVE to do anything.
My guess is that Apple's release of the final version of Mac OS X will have an "updater" to updgrade only:
1. Mac OS 8.6 - 9
2. Mac OS X Server
3. Mac OS X Public Beta (from an "unhacked" state)
If the final release is too late in coming, Apple will patch to automatically extend the "cut off" date for three months or so. They've done this before with other software (MRJ public previews, an OpenDoc beta if I recall right, and I'm sure others). It'll be worked in to the auto-update feature or be a trivial download.
If all else fails, they'll simply remind you that Mac OS X Public Beta was for testing purposes only and that it's your responsibility not to be "burned". That's would be a PR nightmare, but legally they don't HAVE to do anything.