Samsung will include the second generation of its One UI user interface with the Android 10 update
The Android 10 update also includes the widely anticipated system-wide Dark theme toggle found by going to Settings > Dark theme. Live Captions will be available later this year for Android 10 users. This will allow a compatible device to create captions for any video content. Digital Wellbeing will be improved and the update brings support for foldable devices.
The reason why Samsung wants to disseminate a tightly controlled beta program instead of just pushing out Android 10 to Galaxy S10 users is pretty simple to understand. The manufacturer wants to get feedback from beta members to see if there are any bugs that need to get exterminated or changes that need to be made to the software before it is more widely distributed. The final version of the Android 10/One UI 2.0 update is expected to be available to Galaxy S10e, Galaxy S10, and Galaxy S10+ users sometime in December.