Ones on the 5.x firmware can't install 6.0(.1) anyways due to locked down sboot.
And we cannot get a dump of sboot from a working device.
And differences between last beta and this would be negligible as Samsung is finishing up M just to fix their own services and consistencies.
The betas already has CTS passed.
And this is not even a final build.
Internal servers have DPAC and DPAD.
All these cloak-and-dagger with new OTA dump will be meaningless for most users.