That change allowed Android apps to connect to smart devices on the same local network as a Windows PC. Advanced networking was also made 'on' by default for newer x64 Windows builds for PCs with Intel and AMD chips.
Advanced networking allows users to set up smart home devices such as speakers and security cameras with a compatible Android app. As Microsoft explained in May, users can then play conent on a speaker on the same network, or set up a security camera or other smart home device, so long as it has a compatible Android app.
Another change Microsoft notes is that WSA now has the same IP address as the host machine/computer rather than its own IP address. This change is reflected in the developer section of the WSA Settings app by the removal of the the WSA virtual machine's IP address.
WSA runs in a Hyper-V VM for compatibility with open-source Android and Windows device interfaces, such as mouse and keyboard. Windows Subsystem for Linux (WSL) also runs in a VM. Users need to install WSA and the Amazon App Store from the Microsoft Store, and also enable virtualization in Windows 11 to run WSA and Android apps on it.
Microsoft launched the WSA preview last October with support for processors from AMD, Intel and Qualcomm. With Intel technology, WSA can run apps that were made for Arm only on hardware with Intel and AMD chips.
At the moment only US users can install Android apps from the Amazon Appstore preview, but Windows users in France, Germany, Italy, Japan, and the United Kingdom will be able to test the preview by the end of 2022.