For those seeking the official PAN-OS 11 release notes, the primary link to the documentation hub is provided by Palo Alto Networks at PAN-OS 11.0 Release Notes.
Before you upgrade, we highly recommend reviewing the official technical documentation to understand the hardware requirements and addressed issues: panos 11 release notes link
Palo Alto Networks does not keep release notes on a static public HTML page. Instead, they host all official documentation on their Customer Support Portal and Documentation Site. For those seeking the official PAN-OS 11 release
Features Introduced in PAN-OS 11.0 : A deep dive into networking, management, and Panorama-specific updates. and Panorama-specific updates.