Device Changelog:
June security patch
Updated kernel to 4.14.320
Merge latest caf tag LA.UM.9.1.r1-13700-SMxxx0.QSSI12.0
Dropped prebuilt display stack
SDCardFS Deprecation
Enabled case folding support on userdataUse 
FUSE passthrough by default
Imported missing audio and sensor libraries
Reduce the number of pinned acdb files
Enabled full LTO
Various other device tree and kernel changes

Source Changelog:
https://arrowos.net/changelog.php