tl;dr: Homebrew 7.0.0 delivers faster concurrent installs/upgrades, stronger sandboxing (Landlock on Linux, tighter macOS restrictions), a built-in `brew vulns` command with an OSV-format advisory database, and a new native macOS GUI app (BrewUI) for Tahoe 26+. Support for macOS 10.15 is dropped, Intel Macs move to Tier 3 (no new bottles, full removal by September 2027), and formula `post_install` and cask `*flight` Ruby blocks are deprecated in favor of declarative `*_steps` by December 2027.