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See https://wiki.gnome.org/OSTree/DeploymentModel2 This is a major rework of the on-disk filesystem layout, and the boot process. OSTree now explicitly supports upgrading kernels, and these upgrades are also atomic. The core concept of the new model is the "deployment list", which is an ordered list of bootable operating system trees. The deployment list is reflected in the bootloader configuration; which has a kernel argument that tells the initramfs (dracut) which operating system root to use. Invidiual notable changes that come along with this: 1) Operating systems should now come with their etc in usr/etc; OSTree will perform a 3-way merge at deployment time, and place etc in the actual root. This avoids the need for a bind mount, and is just a lot cleaner. 2) OSTree no longer bind mounts /root, /home, and /tmp. It is expected that the the OS/ has these as symbolic links into /var. At the moment, OSTree only supports managing syslinux; other bootloader backends will follow.