Windows 10 21H2 won’t offer many new features. It will behave almost like a Cumulative Update, in terms of size and speed of deployment for those moving from 21H1 to it once it’s available.  Earlier this year, Microsoft officials said the Windows 10 21H2 features would include:

WPA3 H2E standards support for enhanced Wi-Fi security Windows Hello for Business support for simplified, passwordless deployment models for achieving a deploy-to-run state within a few minutesGPU compute support in the Windows Subsystem for Linux (WSL) and Azure IoT Edge for Linux on Windows (EFLOW) deployments for machine learning and other compute-intensive workflows 

However, Microsoft officials said the new Windows Hello for Business deployment method – also known as “cloud trust” – is still not ready and will be delivered in a future monthly update to those with 21H2.  Microsoft officials have declined to say whether or not Microsoft plans to continue to make two feature updates per year for Windows 10 after 21H2. All they’ve said publicly is Microsoft will support Windows 10 until October 2025 with security updates and fixes.