It will be interesting to see if the existing beta tester program will remain for testing advance improvements, but I expect it wont.
I hope they do, and I could see a lot of reasons to do so. They have a robust incremental rollout strategy for FSD updates (developers, all Tesla employees, small external beta group / long time beta testers, newer beta testers, all users). This is exactly how you want to roll out software that is complex to test and is safety critical.
It also gives them user groups to do AB testing on. I'm not sure Tesla has ever confirmed this for sure, but there's a lot of anecdotal experiences where different testers on the same version see a surprisingly large variation in performance (consistent with some runtime tuning that is different).
After the full public wide release of FSD for city streets and single stack highway AP, they've still got a
lot of development to go. Offhand:
- Parking lots
- Driveways and garages (really anything that's not a public road)
- Any kind of maneuvers that require backing up
- Inclement weather
- Slippery surfaces (snow and ice)
- Locations beyond US + Canada
- and just incremental improvements on everything FSD can do today to make it more reliable and work towards L3/L4 operation
- (maybe) some kind of HW4 upgrade with cross traffic cameras further forward on the vehicle (presumably would require some retraining and testing)