Locale X is a major new version. For all of the new features in Locale X, please see the Locale X release announcement. 10.0.379 is a minor update with the following improvements:

Improved compatibility with Android 12. Note that Android 12 is beta software, and we don’t recommend using Android 12 until it is officially released
Improved the Launch Music App template to handle YouTube Music replacing Google Play Music
Internal improvements to support changes in Google Play
Performance improvements

Note: As a normal part of our release process to ensure high quality, updates to Locale X roll out in phases over a multi-week period. It may take some time before a specific update becomes visible to you.