Omarchy 4 aka Quattro is the biggest release since the project started. The entire desktop shell has been reimagined in Quickshell: the bar, launcher, menus, notifications, on-screen displays, control panels, lock screen, and polkit agent now all live inside a single long-running shell process with a plugin architecture. That means Waybar, Walker, Mako, SwayOSD, hyprlock, hypridle, swaybg, and polkit-gnome are all gone, replaced by one coherent, fully-themed, IPC-scriptable shell.
You can upgrade an existing Omarchy installation to Quattro by first Update > Omarchy, then Update > Omarchy to Quattro.
ISO: omarchy-4.0.0.iso
SHA256: 9224fab3720560f771969a99a499e5f7e0f8e2d6a0681d872d52f05fb5003da4
The v4.0.0 notes continue past these opening paragraphs. The full text is the GitHub release linked above.