You can find the official PanOS 11 release notes on the Palo Alto Networks website: https://docs.paloaltonetworks.com/panos/11_0_0/new-features.html
Palo Alto Networks has released several iterations of PAN-OS 11, including major versions 11.0 (codenamed "Nova"), 11.1, and 11.2, each introducing significant security and management enhancements. Quick Access Links to Release Notes panos 11 release notes link
Before you click the link to download, verify these three things: You can find the official PanOS 11 release