It’s not in release notes, it’s on the installation page here.
Running as a VM has been possible for ever and a day. There are a number of ways to do it, one is using a Hypervisor like Proxmox. This allows you to run the HAOS image (fully supported) and then spin up other Ubuntu/Debian/Other Distro to run everything else you wish like Plex, MQTT, camera software, even a Windows VM to run Blue Iris if you wish. You can do this on cheap hardware, second hand workstations off eBay for under $100 are well suited, like an i5 Dell Optiplex, etc.
Guide to get Proxmox with HAOS going is here.