systemd 224 is a small maintenance release that mostly fixes important issues with the KDBUS D-Bus IPC implementation for the Linux kernel, but it also merges the systemd-efi-boot-generator functionality into systemd-gpt-auto-generator and adds Group Policy support for vxlan devices in systemd-networkd. Rolling-release distributions like Arch Linux already upgraded the systemd packages to version 224, so you are urged to update your system(s) as soon as possible.