The build itself is a relatively minor update but there's a new All-In-One 1.5.2 Asset Pack and a new 16-bit Enhanced Texture Pack (now with buildings, props, and Black Dogs). As the build notes say, make sure you remove the old copy of bzone152.zfs from addon!
Unofficial 1.5 Patch Hub with common files shared between versions, documentation, utilities, and more
Version 1.5.2.16 Page with download link and build notes
Update: I uploaded a new version of the All-In-One asset pack that works with the original retail ZFS files instead of the BZ/RO merged ZFS files. If you downloaded the asset pack before 5:50AM central standard time on October 5th, download it again to get the latest version. (The archive should be 16,409 KB.)